Gaussian splats can pretty much be rendered in any off the shelf 3D engine with reasonable performance, and the focus of the paper is generating the splats so there's no real reason for them to mention runtime details
Nothing here seems to have moved that needle.
An A100 is $1.15 per hour at Paperspace. It's so cheap it could be profitably used to scam you out of rather modest amounts, like a few thousand dollars.