I was led to the Zynthian specifically because of that list. I own a Seaboard Rise 2 and I wanted something, that would work without a PC and Equator2, because even though I have a reasonably beefy machine, working with midi through windows is rather glitchy and cumbersome. I tried to find other reviews and sources, but having owned my Zynthian for a week or so, you comment is the first time I have read that it does not support MPE.
Searching the wiki right now, I can see the only time “MPE” occurs is a comment on the Surge Synth engine, which, if I had looked for it, would also have led me to believe the Zynthian would support MPE.
https://wiki.zynthian.org/index.php/Synth_Engines
Also, there were quite a lot of mentions of MPE on this forum, and my lack of experience and knowledge led me to conclude, that whatever issues there were, were not due to it not supporting MPE, but that it would require some fiddling to get it to work properly, See fx.