He's said (I'm paraphrasing) that he goes for popular myths, especially when there's a single video or series promoting them. I've never heard him mention the groove or the dating thing, but aren't those pretty specific? I've never heard of them at all. Maybe he'd reply if you left him a question.
He does address the stonework point in [1] at 6:36[^]—though he says it's not true. He also says at 3:43[*] that archaeologists can make mistakes and don't know everything.
Anyway, I'm not here shilling for the channel. I just found the background info relevant and useful.