You can interact with the videos boosted by this account without leaving Mastodon.
You can watch, comment, like, share, subscribe all from within Mastodon. You don't need to click on the video's link at all.
PeerTube and Mastodon federate together using the same technical standard, so actions you take in Mastodon will appear next to the video in PeerTube.
See the attached images for more details.
@FediVideos there is a gotcha, when you comment, you must not remove the @ to the poster of the video or the comment won't appear under the peertube video. Tested this morning. Dunno if it's intended or a bug.