Yes, I have heard that as well, because having people on the office is going to magically ramp up sales, as that is the missing factor why they aren't taking off. /s
You're misunderstanding what was said. It's about costs/income. RTO (probably) doesn't increase income - but people will (most likely) quit, reducing costs. Thus the ratio gets better.
Most likely, because no one on this thread has been in company meetings from Fortune 500s where this is reason being told for RTO, while they keep doing good old outsourcing as always.
"Collaboration in the office strengthens opportunities for sales" is the message.