there is NO WAY one should take a load of pax at low level without a TCAS
Really?? So all flight 250kts below 10k is unsafe? My first perception was that this captain made a good decision. Logically the 10k cap due pressurization negates it's self due to the speed restriction. Sounds like a frusterated pilot who threw a tantrum, if he wishes to do this to bring light to gulfstream's operation it's his career on the line, his choice.
This is not a flight safety issue. It is being bent here into another reason why gulfstream should not operate as it does.