This situation isn't fun for either side and I can understand both arguments. Being late for personal reasons, internet disconnect, technical issues etc. could happen to anyone. It is probably just as likely for Siedel as anyone else.
I don't know. If it was me in high stakes
real money - I'd probably blind them out. I know that sounds wrong, but I'm trying to imagine what I think I would really do. It would be different if you understood the circumstances or how long the delay could be, but you might be waiting for the rest of the day for all I know. I don't think his decision was "out of line" at all. Choosing to delay the game as long as possible sounds like an honorable route, but I don't think it is his responsibility to do this as an opponent treating his opponent with respect and of the "competitive spirit."
I think best would be if the online site (or live locations for live games) had preset rules on how long the game could be delayed for based on "no-show" cases. This is how it is for many other sports/games.
Take golf for example. In match play golf (form of play that is 1 v 1), for the PGA/USGA (United States Golf Association), everyone has a set tee time to begin the match and typically are encouraged to arrive much earlier. If one side isn't present at the designated "start" time, then the "no-show" side gets a penalty of 2 strokes or loss of hole (2 stroke penalty for stroke play tournaments and loss of hole for match play) if they arrive within 5 minutes late. After 5 minutes of "no-show", then the absent party is disqualified (keep in mind that most golf rounds take about 4.5 hours if they did show, so 5 minutes is very little time).
I also play chess and USCF (United States Chess Federation) has similar rules for no-shows.
https://new.uschess.org/news/just-rules-tardiness-101
If they don't show up within a certain time from the start, then they are disqualified.
Poker would make sense to have a similar procedure in effect. Maybe "blinding down" wouldn't be allowed, but the "late" poker player could have x-time to show up and if still not present then disqualified. Maybe even like golf, have x-penalty for showing up late but not late enough for disqualification. Maybe a penalty like having to post a straddle for a few orbits or something.
I don't know, just giving ideas. Siedel played within the rules though: I think the call for justice just means that the rules need to be changed.