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In order for your exclusion rule to match the generated event, you must include the specific time as well. I expect this is because if you had events repeating multiple times in the day it wouldn’t know which one you were trying to exclude.
(If your events were “all-day” style events, without a specific start time, then setting just the date in exdate would be ok.)
Therefore, changing
rruleSet.exdate(new Date(Date.UTC(2019, 10, 22)));
to
rruleSet.exdate(new Date(Date.UTC(2019, 10, 22, 10, 30)));
will solve your problem
Source:stackexchange.com