Very nice, but a) you’re quoting Sephardi halacha, which is not applicable to 99% of the Coffee Room, and b) you can give me all the sources in the world, but the minhag is to abstain from meat entirely, period end of story, barring of course a medical condition in which case the person would for sure be very careful about checking labels.
I am sure no one is going to serve vegetarian meat during a siyum which falls on the 9 days (which, imo, is completely designed to cater to people’s taivos). It would completely defeat the purpose.