In recent times, it seems that RVF guys have become a bit less aggressive in their various negative bitcoin predictions, as compared with last year and even earlier than that.
It seems that the most recent BTC price surge from $3k-ish to $19k between August and December took a lot of steam out of the negative assertiveness of a good deal of guys.
Surely other coins are pumping too, and surely some guys are doing better by having a portfolio in other coins rather than sticking to a mostly bitcoin focus, so there can certainly be some individual variance.
Of course, when BTC prices had gone from $3k to $19k, there were going to be BTC is a bubble assertions, such as this the assertion of the OP of this thread, that end up seeming to be correct, but also decently sized corrections have already taken place from December to present to bring BTC down to $5,920 in early February and then $6,440 in early April.
Price downtrends can take a while to happen, so it remains unclear whether this particular BTC price downtrend is over yet or if it is going to continue, and whether PolymathGuru's "buy" suggestion from May 14 seems prudent.
Personally, if I was just getting into bitcoin, I think that developing a BTC buy strategy now, and accumulating bitcoin now, would not be a bad starting point, and surely, I think that the odds are a bit against any guy that would be waiting for BTC prices below $6k, even though that is possible, too, and even waiting for BTC prices to continue to drop from here might not be to be a very prudent approach for anyone who has no stake in BTC.
On the other hand, I tend to be a bit of a broken record in my seemingly ongoing suggestions that the best time to buy bitcoin was yesterday, and the second best time to buy bitcoin is today... .hahahahahhahaaha..
but still no matter when you start to buy BTC, you need to tailor an approach that works for you and your budget, timeline and circumstances, so even if you had begun to buy in the about $8,350 to $8,900 price range (as the price had been fluctuating on the day of PolymahtGuru's post), you would not have been in a bad time to get started in bitcoin, so long as you continued to figure out an individualized strategy that might include buying as the BTC price goes down (or buying on price dips, as some might describe it).