Though I disagree with them and with you--I downvoted that post for its writer being a jerk, not for being subjectively wrong. "If you think virtual whiteboards maybe aren't very good you should give somebody else your remote job" is "man, shut up" territory.
Turn-taking in general is better in person due to high bandwidth channels for nonverbal communication.
I say all of that as an autistic person who has trouble with all kinds of tacit communication (it may be that I have studied it so much in order to fit in that I really notice it), so yes there are downsides to being in person (I can pretend to make eye contact on a video), but I'm talking here about why the average developer or product person might have good reason to prefer in-person for a two pizza meeting.
Nice whiteboarding app affordances are great, but the low effort of onboarding to a physical whiteboard also encourages broader participation.
Interesting. I honestly assumed that virtual whiteboarding was universally considered worse than physical whiteboarding, purely because it is amongst everyone I've worked with.
It's interesting to learn otherwise.
Also, no judgement about attire, eye contact, stance, or demands to stay during a fire alarm ("it's just a drill!").
Shame that Slack killed Screen Hero. Perhaps the founder's Pop.com effort will catch on.