Having contributed to youtube-dl in the past, long turnaround times from the maintainers was pretty normal. I've had (and still have some) open PRs that have been ready to merge for going on a year. The two months is really not that big of deal.

That being said, the project probably could use some reorganization. It requires a lot of community contributions to keep all the extractors maintained so long turnaround times for reviews isn't ideal.