We are pointing out that he's running a high risk, its up to him to accept that risk or not. There is plenty of evidence that these turbos fail quickly at that boost, and quite a few instances where turbo failure has destroyed the engine. It makes a very poor cost/benefit trade off for most people.
None of us were there, but what's the relevance of that? We are taking OP at his word, and assuming that he understood what he was told. If we dont make those assumptions there's no point in responding.
FWIW, my stock GTR turbos failed at 13psi. Fortunately, no motor damage.
This is a community, and as such we should look out for each other. If I were in OP's shoes, i'd want to know about the risk.