The 200+ number is factoring in the Battle of Geonosis as a whole. Not all of them were fighting in the arena, however. Either way, like 90% of them were killed... No name Jedi are absolute fodder, tbh.
In canon it has been exceptionally rare for Force users to single-handedly fight droves of opponents by themselves and come out on top(without some plot-devicey antics.)
I can think of plenty of examples for other notable Jedi performing large-scale combat feats. Off the top of my head, there was Yoda nearly wiping out an entire droid army single-handedly, with very minimal support from his clone squad in Ambush.
Then during the liberation of Ryloth, Mace Windu was depicted holding off multiple waves of battle droids while waiting for his clone support to reactivate the plasma bridge. He even wiped out an entire wave of droid reinforcements with a single Force push.
During the episode Defenders of Peace, Anakin wracked up a kill count of around 80 when he took out an entire droid squad single-handed (by my count, each squad had 48 B1s and 10 B2s), not to mention he also took out both AATs present, the Defoliator prototype, and helped whittle down the first three droid squads as well before launching into his solo attack against the fourth. All while still recovering from a debilitating injury.
The Blade of Bardotta, Porter Engle, also single-handedly brought down an entire Nihil strike team in the High Republic Annual comic. Even one or two Nihil could be a threat to most Jedi due to the drug-crazed, suicidal tactics they utilized in combat. So again, while not quite army-busting, beating a few dozen Nihil with absolutely zero back-up is nonetheless pretty impressive.
I was moreso speaking to examples of Jedi/Sith army-busting without any sort of outside assistance or w/e... Similar to Vader's showing here: (please log in to view the image)
Because yeah, soloing a few dozen opponents is one thing. Soloing hundreds of opponents is another matter entirely.