Still, even he was formally recognised, if he made a false claim about his retreat or studying, I would worry. But nowaday it's really hard to seperate what is fact and what is not.
If all the Chokling lineage holders agree that he is fake then it seems pretty clear. . . !
I hope things can be pretty clear, but there are some problems here:
1. This CJP rinpoche claims that his recognistion from Azongdrukpa rinpoche has been approved by 17th Karmapa when Karmapa was in Tibet. (of course this need to be checked ) Karmapa used to have a final say on Chokling tulku issue.
2. If we say Azong drukpa Rinpoche really recognised him, I dare not to say that he is a fake, no matter Azong drukpa Rinpoche is a chokling lineage master or not. But I have to emphasize, that's the case if Azong drukpa Rinpoche really willingly recognised him. I didn't see the recognition letter yet.
3. Well, it's a bit problematic nowadays really. Some great masters are in Tibet, some are in India. I have heard quite some stories about things turned confusing.
One of them: Kathok monastery, a main sub-school of Nyingma tradition, made a public claim 2 years ago that some 'tulku' should be ticked out. One of them is called 'Drukdrag Rinpoche'; base on Kathok monastery's claim, this person is a close family member of a great master Khenchen Pema tsewang, the guy went to India with the great master, met HH Mingling Trichin. Then the great master passed, he went to Kathok saying that Mingling Trichin recognised him as a tulku, so Kathok also treated him as a tulku. Finally Kathok found that Mingdroling part didn't actually recognise him as a tulku, so now the monastery claims that he is a fake. That's just the story from Kathok, this Drukdrag Rinpoche got his own version too.
The good thing is, things can also be not that complicate. No matter he was properly recognised or not, it's you to decide if you are going to take him as your guru. If you know something about him is not that proper, even he was really recognised, you can still keep distance. I agree with Magnus, tulku real or not is important, but before you accept a lama, you need to check more than that.