When we finally know the truth, we can then say his credentials don't matter in the context of an Opposition MP. At the moment, we're just speculating. Some are already jumping the gun to defend him, as if he has something to hide. Why feel so insecure ?
The problem is that you are asking him these questions in this forum full of annonymous members.
Why don't you send an e-mail to ask him or ask him personally when you are back in SG?
I repeat, the credentials don't matter if he is carrying out his work properly as an MP.
Don't let the pap mindset be ingrained in you that an MP has to study 12 years, go to university, come out to work and get a job
in the civil service, stat board, glc, ntuc, saf, police, etc etc, and then he is fit to be an MP.
The issue is not about insecurity or whether you plan to attack him. The issue is why does it matter?