I don't think this is true.
e.g. LHR-LAX gives you 140 tier points each way, so 4 flights = 560 points - not even Silver on BA. BA require 1500 tier points for Gold.
I was talking about a routing like JFK - BOM/DEL/BLR in J. It is 140 for each segment. However my mental math was broken. EXP is 4 trips and BA Gold is 3.