Agree, I wouldn't post that either
That does not really look out of focus so much as hazy or blurry. Almost like an old Vaseline gel. I think it really is in focus as far as the camera is concerned, but something is wrong with that lens. My guess would be either something is loose inside so that the elements are no longer in the proper position or someone opened it up and put an element in backwards or in the wrong order. It might also be internal haze or oil on the elements but it does not look quite right for that.
Hopefully someone with more Tamron experience than me will stop by and help you more.