God hands people over delusions when they push against his truth.
He resists them for a time, but if they persist, then he let’s them go their own way in hopes of teaching them a lesson. This leads such a person into a wilderness of their own making.
Those that seek will find it. Those that do not seek truth will instead end up deluded. God also sends strong delusion to those that reject the truth and thus they choose a different way than the truth.
So is God the one deluding them? No, they delude themselves with their dishonest search for truth. They have decided for themselves what they want to believe. They decide what reality fits their own desires best. God convicts them and sends people to them to help them, but in the end if they continue to reject truth and God, then he hands them over to believe strong delusions.
At some point they will realise that they have lived a lie. Whether that is in this life or in the Judgement to come. Hopefully it is in this life and they have that sober moment of realisation which offers them the first step to repentance and good works toward God.
Does this describe you? If you are willing to give your life to the creator of the Universe, then please read this:
