No, having someone near you to remove the stun or PB the lurker is a valid counter. Assuming no mistakes happen (not realistic, but still) the lurker is unable to do anything without dying, it’s countered. Even if it doesn’t make the mistake of attacking the counter persists - it’s deterred from engaging entirely.
Or she just doesn’t walk off far enough where you can actually punish her with that - i.e for you to “counter” screech, it requires her making a mistake and walking off far enough into the open and then screeching badly. Her walking out and screeching doesn’t necessarily result in her death, because it relies on her positioning, not you “countering” her. She has to make a positioning mistake first before screeching for the “screech counter” to be effective, you do not counter the screech itself, but capitalize on the queen’s mistake. The queen still has valid ways of using the screech that make your “counter” pointless, therefore it’s different from the lurker scenario, where any engage it attempts is a mistake.
With queen, if you all run and wait a screen away the queen can just choose to neurodrag the poor fella who didn’t or couldn’t, at that point you’re losing the player - wouldn’t call that a counter - or rushing in and getting screeched anyway. Even assuming perfect play as with the lurker, the only counter to scree is not to play - you all run back and xenos retake all the ground because you cannot contest them beyond screen edge firing or scopes.
Technically you could argue diminishing effectiveness is a soft-counter and thus a counter, but the way I see it - assuming nonperfect/realistic play this time - there’s a major difference in scaring away a lurker and turning a death into a bonebreak because you have a buddy nearby, vs losing 5 players to screech instead of 10 because people positioned properly. To me, one looks like an actual counter, the other looks more like cope.
I.e At most you can diminish the effectiveness of screech somewhat, but still pay a price large enough that it doesn’t feel like much of a counter - it still leads to you losing if repeated several times, you’re just dragging it out hoping for the queen to make a mistake. Counters do not rely on the other party making mistakes, it’s just a lack of counter if it boils down to the “just dodge”(just hope he misses).