If that happens, both mortgage rates and home prices will fall (due to lower demand / ability to pay and possibly forced selling).
The article doesn’t mention this scenario, even though it’s entirely probable. If you are waiting on the sidelines, that might actually be a good time to buy.
Of course the catch is that if the recession is bad enough to crash the housing market, you may find yourself out of a job and unable to afford anything, so the premise of the article stands — it may never be a good time to buy a house, at least not in the average buyer’s circumstances.