Even if you ‘record’ something to your YouTube TV DVR, if there is an on-demand (with ads) version available from the network, your DVR recorded version will be replaced and you will be forced to watch the on-demand (with unskippable ads) version
There are 3 versions currently available to me for S46 E16: two DVR and one VOD. If I select either of the two DVR versions, I can skip commercials as expected. The VOD version forces me to watch commercials (also as expected, I guess).