The guy may well be a satcoms expert, but he's operating way outside his comfort zone if he thinks that makes him an accident investigator or an oceanographer:
"If MH370 had crashed with a really hard impact, we would have seen small pieces of debris floating on the sea immediately after that. Furthermore, the flaperon that was recovered (from Reunion Island) wouldn’t have been in one piece…we would have only seen bits and pieces of it"
"One cannot underestimate the power of the ocean current…recently, a Russian woman who was considered one of the greatest free divers of all time failed to surface after a dive in the Mediterranean and she is feared to have encountered a strong underwater current"
MH370 sank almost in one piece, expert claims | Free Malaysia Today