One of the pictures of the source link confirms that Hetfield used this pedal at some point.

Trent Reznor is confirmed to use the Electro-Harmonix EH-7959 Bass Micro Synthesizer, as documented in the Fragility Tour program, which lists the equipment used in recording "The Fragile" according to nin.wiki.

"Satch goes wild with gear and musical experimentation on Engines of Creation. The album's techno edge, sequenced rhythm tracks, and heavily tweaked guitar parts proved challenging in rehearsals. But because of his open-minded approach, and a willingness to let bassist Stu Hamm and drummer Jeff Campitelli re-purpose parts they could pull off live, Satriani has brought the way-out-there sounds back to Earth on his current tour. Here's a brief rundown of what he's using on stage.

Guitar.com: Did you have to bring any special gear with you to re-create sounds off the newest album?

Satriani: We tried. We used things like Moogerfooger pedals and Electro-Harmonix Micro Synths and Bass Micro Synths. You know, Hafler Triple Giant preamps. We used a lot of fun gear on the record. It's very pedal oriented. But I found in rehearsal that this stuff, when you turn it up really loud, it doesn't really hold up, and it doesn't project as much. And I thought, 'You know, I don't want people in the 30th row to be looking at some guy's head while he stares at his feet stepping on pedals all night.' So I said, 'I'm gonna do what I've always done; I'm gonna do what Hendrix proved could be done. I'm gonna make a really trippy record, then go out live with a really loud amp and a couple of pedals, and go for it.' You just make the music new again. You keep it simple.

So I found that I could use a Fulltone Ultimate Octave to replace a lot of the stuff that I used in the studio. And there is still one section in 'Borg Sex' that Eric uses the Electro-Harmonix pedal for, but he's hoping to replace it with the Fulltone pedal. The Fulltone pedal is a more straight-ahead pedal; it sounds exactly the same every night. The Electro-Harmonix are really unique, but they seem to sound different every night. And that can be a problem."

In the centre of this pic is the microsynth

Behind Geezer, on top of the amp, you can spot an EXH pedal with sliders. My best guess is that this is a Microsynth

In the video titled "Bootsy Collins Tours His Incredible Home Studio 'The Boot Cave'" by Reverb on YouTube, at the 0:34 mark, an Electro-Harmonix Bass Micro Synth pedal is visibly placed on a pedalboard within Bootsy Collins's studio setup.

Listed on Reverb.com in November 2020.

at 5:00 the Bass Micro Synthesizer can be seen under the SidStation

https://www.youtube.com/watch?v=D03gQAtc3gc At 00:35

Serge Teyssot-Gay uses the Electro-Harmonix EH-7959 Bass Micro Synthesizer, as shown in a user-uploaded photo on Hostingpics.

In this Latest Noise article he says he uses a "big silver box era EHX Bass Micro Synth. That synth pedal was first used on the breakdown of "Run Thru” and has been used on almost every record since, for the songs “Touch Me Pt 1”, “Look at You”, “Smokin From Shootin”, “Compound Fracture" etc and the trailing sub octave chords at the end of “Circuital” and the title track from Strand of Oaks “Eraserland”… I love that pedal"

David Funk is confirmed to use the Electro-Harmonix Bass Micro Synth XO pedal, as evidenced by a post on his Instagram account, thedavidfunk. In the video, he showcases his pedalboard, which includes this pedal, and mentions, "here are all my gain stages on Bass!" The post highlights his preference for the MK1 model due to its responsiveness and aggression, which he uses for live recordings with Bethel Music.