hashforce is not on the dev team so don't bother with his comments. There are hypers for almost every coin (see poloniex trollbox). Give priority only to what the dev team says.
Some people bought NAV when it was in the sub 1000s and scaring new investors to dump is a pretty routine strategy for buying NAV again in low prices.
NAV is a big technological innovation which has just started and as previously quoted by pakage "NAV is a mid-term investment".
The key to success is taking risks and going long.