I don't think most people who are critical, here or elsewhere, think Taj set out to scam fans with this project. Rather that he seems to simply have bitten of more than he can chew, and does not have the experience and/or work ethic to get this project done. Fans wanted this project to succeed, hence why so many people donated.
Taj is the one who said the project would be finished this year (after saying it would be done last year previously). He's the one creating expectations and then not delivering time and again. Again, if he's still at the stage of hiring fans, then that suggests he's nowhere near done. If this doco is supposed to be out by the end of the year, he should be doing some final finetuning now. Instead, there's still zero evidence of him having conducted any interviews except a day of shooting in 2019. Btw, everyone who has cooperated with this project signed an NDA, so even if they'd think it's going nowhere, they wouldn't be able to say so.
As others have said, just imagine this being anyone but Taj or another family member. Would you really be defending Jin Chohan if he, after 5 years, still had not given a single update of substance and was instead writing posts about wanting credit for a press statement and poem?