Seems to be net savings, quoting someone else :

https://www.pnas.org/doi/10.1073/pnas.2222103120

The societal cost of a shelter stay in Vancouver is estimated at $93 per night (6), so fewer nights in shelters generated a societal cost savings of $8,277. After accounting for the cost of the cash transfer, the reduced shelter use led to societal net savings of $777 per person a year.

From the linked study:

generated societal net savings of $777 per recipient via reduced time in shelter

So giving them $7500 reduced shelter costs by $8277. I would guess the total "societal cost" reduction is even higher, due to the harder to calculate indirect costs; but those are difficult to validate.

Also, there's 99 shelter days saved per person, $777 for that period would be incredible. If you've got a secret to run a shelter for < $8/bed/day, you're going to solve homelessness and the housing shortage.