I don't think it's fair to try to justify bad content by trying to slice out players who aren't participating in it as 'not counting'. There are severe flaws in that argument aside from that pretense, the foremost of that is:

You don't need 3.3 to do Alexander.

No matter how you try to justify the percentage base even if you were to half the number of current 'applicable players' the percentage is miserable. The content just barely started to resemble something that narrow margin of raiders that established themselves back in Coil Era enjoyed. But we're forgetting that even Coil Era clears and participation was bad.

Seriously, quit defending raids. Pretty much everyone who raids has criticisms leveled against it - even those who are trying to say that they're not 'as bad'. Recognize the Stockholm syndrome and actually work to discuss improvements.