What he described is real, and it also does not tell the whole story.
Reinstatement is the term for catching up on all missed payments plus fees to stop the foreclosure. Three months out, many owners still believe they can reinstate, refinance, or find a family solution. The urgency is abstract. Three weeks out, that math has usually collapsed and the auction date is a concrete, visible thing on a calendar. That psychological shift is genuine, and experienced operators do see higher conversion rates late in the window for exactly that reason.
The structural problem with a late-only strategy is inventory loss. Some owners sell early to another investor who reached them first. Some work out a loan modification with the bank. Some get a family bailout. If you skip the early outreach, you are selecting from whoever is left after all of that, and in a competitive market that pool shrinks.
The guide on this strategy (Guide tab on the pre-foreclosure page) describes early outreach partly as relationship-building, so that when the owner reaches the urgent window, your name is already familiar. That is the piece his framing leaves out. He may be right that his closes happen late, and still be benefiting from early touches he is not fully crediting.
A thing worth confirming: his close rate at weeks three-to-four versus earlier contacts, and how many of those late sellers had already received his mail earlier. That data would tell you whether late-only works or whether the early mail is doing hidden work.
I would also flag that the ethics of late-stage outreach deserve real attention, since owners that close to auction are under serious pressure. A real estate attorney in your target state can tell you what contact rules apply at that stage.
What counties are you considering, and do you have a sense of the foreclosure timeline length in those states?