> A law like this is essentially there just to further incentivize the return to office policies that we've all been reading about. Now there will be an additional cost associated with going remote.

Not an additional cost, just fewer savings for companies. I'm guessing that even having to reimburse employees for internet/power they're still saving a ton of money on those things (my last office was lit up everywhere 24/7), plus not needing to rent the office space, keep food and coffee available for employees, keep bathrooms stocked up, etc.