He's never been washed. The issue has always been he changed his style to this much worse boxing based, power heavy style.
Conor is best with his karate, in and out, combo heavy style style. It's what works with his timing, accuracy, and power level as it always hid where the real shot was and ensured there were always more coming. Guys weren't kidding when they said they had no idea what he'd hit them with.
Now it's blatant and while it may still catch guys, as Poirier himself said it did, the effects nowhere near as devastating as he isn't actually some Ngannou who can shot you off with 1 shot. They're just likely to recover.