He's referring to market timing. Most people are shit at timing the market (don't blame them, even the wall-street pros are the same), so if you don't get shaken out of the market during the mini crashes that eventually occur you will end up making profit _IF_ you hold on to your coins.
So buying mining equipment helps you with "market timing" because your coins are locked for months? And if(!) you get your mining hardware the coins are slowly dropping into your wallet again. Maybe I should offer an "I'm holding your coins"-service for people who are unable to hold onto their coins.
The issue is that most miners are cash poor so they did not have a lot of capital in fiat to put into mining hardware, so they were forced to pay for that hardware with btc.
What's the point of this statement? This discussion has nothing to do whether you are poor or filthy rich. You have an amount X which you can either invest in BTC directly or in mining hardware. If you have already have an amount Y of BTC you can keep them or sell them. (Buying mining hardware is equivalent to selling them.). It does not matter if you have 1 BTC and 1 EUR on your bank account or 1000 BTC and 1000 EUR.
This is kind of like being bullish on gold and wanting to invest in gold mining companies but since you have no cash you sell all your jewelry or gold coins and bars to buy gold stocks in the hope of getting more physical gold later on.
It's just stupid. I did it myself and all I can say now it's just stupid*. Mining hardware that does not ROI in BTC does not make any sense, as it has been stated multiple times. See the post by prawda with this very simple calculations. Yeah, it's that easy. Don't agree? Show some calculations that prove him false.
* I made a ROI of 200+% on my Bitfury investment. So why am I advising against buying hardware? Because I don't want the network to grow so I can have more profit? Nah, that's not going to work. There are so many (semi-)private mines (100 TH project, ghash.io etc etc) which deploy mining hardware at cost, it's useless to convince consumers to not buy mining hardware. It's because I'm genuinely convinced current mining hardware offers are a rip-off (now even more than before the race to 1000$/BTC). Why buy mining hardware now that will only produce 30-40% of the BTC you could have if you just bought BTC directly. It does not make any sense. Not at all.