No we don't know, but I wouldn't risk it. In the event there is no more bull run (double top). Buying bags now is the way (the *only* way) to end up with heavy bags of BTC that can't be sold. If he gets it wrong, he will have to DCA for years trying to lower his costs and praying for another bull run.
Having a bit of money to play, sure, why the hell not. Volatility is high, there is money to be made, it is a fun time, it is exciting and a good life lesson. However the time to take out savings into crypto was 1 year - 6 months ago when it was low. Investing now is buying high and chasing.