Yes, the result of PMT formula include both principal and interest. I am not against your point. 60% is still a lot. But I think should do the math right.
I think you had a major calculation mistake. The Repayment p.a. Should be the result of following excel formula
=PMT(33/480/12,30*12,480000,0)*12
Which is about 37,839 or 60% of income