That's quite catchy. But nonetheless, people can "cover" by renting or buying. And in particular, to the degree that mortgage payments are greater than the equivalent rent, one is indeed investing in the real estate market. This is often good, but it can actually turn out much worse than (say) simply parking the money in an index fund.
This is more meant to attack the idea of a primary residence being an "investment". If people insist on calling it an investment, then it's fair for me to insist that it's only covering a short position, because you need somewhere to live.
I think, if anything, this position is actually supportive of making an educated rent vs buy comparison, by discarding any kind of "investment" potential on the buy side.
