I really doubt they scouted him at any point. At rivals anyway, a 2* is almost always someone they haven't followed... and he's a 2* there too.
STOMP
Ah but they have, according to Matt Prehm and Justin Hopkins, he was fully reviewed and they agree with his ranking wholeheartedly.
Hopkins
"I trust JC Shurburtt and his evaluation of Pisarcik. Personally I also didn't see anything that made me go "wow""
Prehm
"I think Pisarick's ranking is solid. He doesn't come from a state known to produce a lot of elite players and a telling sign is that some of the local D1 schools hadn't pulled the trigger."
As for Rivals, I might agree with you if Pisarcik was ranked a 2 star before, but as it is he was NR then evaluated recently. with all the stuff they have to do heading towards signing day, who knows if they will get around to re-evaluating him.
Scout hasn't ranked him yet.
ESPN however ranked him recently and seem to think more highly of him than Brenner. Not great still but a 3* 76 ranking in their system #48 OG. Not great and number is less than 247. But keep in mind that ranking system is different and 247 has him ranked past toe top 100 OG.
but yeah, 247 says they have scouted him and both of the Oregon duck site staff state they fully agree with the ranking. So... your kind of wrong there.

247 this year has been dropping the ball all season long this year though.