Some, but definitely not all. And I don't think the QBs are why our passing plays are designed that way, there's just a lot of plays where we can take advantage of defensive alignment. There aren't always passing reads, because the reads are pre-snap for handoff, keep, or throw. We have plenty of pass plays that involve reading defenses, and anecdotally I haven't seen him just lock onto a guy whose covered anytime recently. Again the second Rutgers pick could count, but it looked to me like he cycled through the downfield receivers and thought he could fit it in late.
I also think the downfield struggles narrative is entirely coming from OSU/NW (when we didn't really call any - probably due to the defenses and lack of receiver involvement) and post-injury Minnesota. TD/INT is an issue for sure, I don't know why we can't throw TDs. I think some of it is a symptom of our lack of big plays as well though, when we score we're grinding it out so the TDs are shorter and more likely to be runs. And we still have fans saying we throw it too much in the red zone.