https://www.theday.com/article/20201205/NWS12/201209641"Even before Covid-19, 2600 people a week were leaving NYC"
https://www.bizjournals.com/buffalo/news/2020/12/02/western-new-york-population-clock.html"Western New York loses another person every 2 hours and 41 minutes"
The first article goes more general after detailing New York City, looking at the national.
Does the state lose 2 seats? The apportionment estimates I've found are all end of last year, meaning pre-Covid and that's not baked in. Its impact is probably limited due to how close the lockdown occurred to the magical census date but it has to have some effect.