There is no tilt shifting in that photo. Neither physical (by actually tilting a single lens inside the lens assembly) nor digital. What you’re seeing as blurryness is just normal how camera focus works.
They may have applied a slight vignette blur to the edges, but it’s really hard to tell with the light bleed on the left edge.
He means there is deliberate perspective making the big truck even bigger in the photo.
Notice how the whels of the small SUV are the same size. And the front tire on the big truck is like 20% bigger than the rear.
That may well be the case that this is what he means, but how would we know when he calls it tilt shift anyway? Cause that’s not what “tilt shift” means.
If he wants to say it’s photoshopped or whatever, just say that instead of using terms that clearly don’t apply.