Several of these I think are a stretch to call suspicious. ‘61 year old man dies’ and ‘hiker disappears’ are things that happen every day, even with people nearby. The inclusion of people who were retired when they died or disappeared is also weak evidence to me, since the implication is that this is being done to harm US scientific capability and retired people aren’t the main movers there. Given the original quoted source is the Daily Mail I question whether ‘no cause of death was given’ means they contacted the county for death records and they had no info on cause of death, or if they just read obituaries that didn’t list a cause of death (very common).
If these are unusual numbers for the amount of people NASA has hired (active and former) it should be looked into, but without further evidence it’s shaky to me.