Is what was understood from Fatwa No. 234382 correct, which is that the one afflicted with WASWAS (obsessive doubts) should not pay attention to doubts, no matter how varied, numerous, repeated, or if they occur for the first time?

This is correct. He must frequently seek refuge with Allah from Satan and busy himself with remembrance (dhikr), recitation (of Quran), and righteous deeds. For it has been mentioned in the hadith that Satan has a "touch" on the Son of Adam, promising evil and denying the truth. And the angel has a "touch," promising good and affirming the truth. Whoever experiences Satan's "touch" should seek refuge with Allah from it. The Prophet (peace be upon him) commanded seeking refuge with Allah from Satan and spitting to the left three times upon feeling his presence.