Da'wah is lies, and they are liars. Nothing they can say, no matter how slick the dawah propaganda, or 'narrative', will change that. Liars will fool some tiny miniscule amount of vulnerable people who have good natures and are easily fooled, or people who want to be fooled, but in this day and age, in this society when dawah liars have no way to enforce society into silence (unlike in Islamic countries), liars will simply always be exposed as liars. Its as simple as that. Liars are liars and will always be seen to be liars, and lies will be exposed as lies.
For their own sake, I would be charitable and accept that they sincerely believe their nonsense (because they desperately want it to be true).
It is good enough if at least a few of them are able recognize their mistakes and change (whatever the change maybe). I mean, they didn't have to do any of this; they could have easily just went "you are wrong lalalala" and I am sure they would still have their following of gullible circle-jerkers. So I'd like to take it as a step for the better since they are going out of their way to let people know their old arguments are shit