Home I just inspected has Cracks all the way around the room at all corners. While in the basement i noticed some questionable work that I am certain was not done professionally. Please see picture. I recommended they have a structural engineer come look at the house as the video shows the cracks. So the question is would you of done the same thing?
The temporary post in the basement is enough to call out an expert, and disclaim everything about the basic support.
The cracks above are incidental to what’s going on below. We’d need to see more photos of the support, floor joists to get really detailed. But you don’t. The temporary post and beam are indication enough of a serious issue that needs proper attention. Just the rotted wood on the floor would be enough to create a major red flag. I would lead the report with this, don’t burry it at all.