Many financial and law firms including the one I work for require in officer 3 out of 5 days a week. It’s not just the 100% WFH who are impacting the numbers. Interestingly enough the PATH and the MTA 4/5 are very crowded with only Fridays seeing a noticeable drop off.
Granted it's not at rush hour but all trips inbound were at about 10AM on a weekday.