No, in contrary, @Gargron clarified that also using user level domain blocks "stops your posts from being delivered to or fetched by Threads", which obviously prevents "#threads users to see and interact with your content".
(Of course not protecting against screenshots, data cached before you blocked, or not using authorized fetch.)
That's exactly a perfect sample for the importance of basing all these #threads, #meta, and #fediblock discussion on technical reality.