There may be some analog artifacts which are hard to duplicate precisely ... but methinks the point of the comment is that a mere cell phone can produce far more sophisticated & realistic sounds with great ease.
Give app Animoog a spin. Close enough to the old boxes for most applications; if you _need_ that special tone exactly, your need will warrant the high cost for the actual old boxes or advanced reproductions thereof.
Sure I will check it out but no way it sounds like a modular. I have played on many 3-5k keyboards and they can’t do it. It is more than just analog artifacts - it is the fat moog sound itself. I am sure it doesn’t matter to younger generation players who probably have never played a 1st generation moog or arp and were raised on crap music sampled and compressed onto mp3’s. The new moog clones come close. Not practical to buy a moog modular 35 system.