It does actually matter, because that is what is happening.
Head over to the [email protected] link that you shared as an example and notice that the posts are 3+ days old and all the recent posts are from instances other than beehaw; this clearly shows that Lemmy.world has not been receiving any data from beehaw for some time already.
As for hurting Lemmy and driving people to threads, is a baseless argument; anyone wanting an experience that Threads offers is not coming to Lemmy; they would either already be there or would be coming from Twitter/Mastadon. Lemmy at its core is very far from what Threads/Twitter/Mastadon try to be.