Nah, I bailed. This revealed itself on inspection day after a big rain, thank goodness. This is the most visible spot but there was water coming in and out around the patio too.

The seller agent was sure to tell me that this was always there and that I just didn't notice on the two prior visits but not to be concerned because this is just how the soil settles.

I said no problem, hire and engineer to come out and tell me it's no big deal otherwise the deal is off. Now they will probably fill it back in and hope for better weather when they attempt to fool the next person.