As has been pointed out several times, until satellite imaging and computer power existed to high enough standards in the 1990s, it was not possible to carry out the research. It was therefore not possible to set back any research since they couldn't have done it even if they wanted to.
I think part of the problem may be the definition of "rogue wave". As I understand it, a rogue wave is a wave much larger than the average local wave with no apparent explanation. All the reports of waves you have quoted have reffered to storms, squalls and high winds and often high seas. In these conditions large waves are to be expected and would not be considered "rogue", even if larger than usual, since there is very good reason for them being there.