It used to be true, but companies seem deadset on demoralizing their workforce as much as possible.
They've raised prices as much as consumers will bear.
We're getting near the physical limits of how efficient things can get in many sectors.
If P/Es are to remain this high (and they have to for the rich to remain this rich), the profits must continue to grow far in excess of the total economy.
The only orange left to squeeze is labor costs.
One very real factor that actually does act as a gravitational pull for doing layoffs in Oct/Nov Q4 is insurance elections. Waiting until January can create a lot of complicated paperwork and cost more. There is also very much a sense that doing layoffs before the holidays, while giving severance pay, is more humane than waiting, because they can "spend time with family" (real words I've heard stated).