The link is for Sonniss collection of royalty free music and sound effects that get released with each GDC.
Here's the more important part of the license, tldr you can use it on any number of commercial projects:
RIGHTS GRANTED
a) Licensee may use the licensed sound effects on an unlimited number of projects for the entirety of their life time.
b) Licensee may use and modify the licensed sound effects for personal and commercial projects without attribution to the original creator.
c) Licensee may publicly perform a reproduction of the sound effects over any form of medium.
d) Licensee may use the licensed sound effects for the purposes of synchronization with audio and visual projects the Licensee is involved with, which includes but is not limited to: games, films, television & interactive projects.
NO AI TRAINING OR USAGE
For clarity and avoidance of doubt, the Licensee is expressly prohibited from using any sound effects licensed under this Agreement for the purpose of training artificial intelligence technologies. This includes, but is not limited to, technologies capable of generating sound effects or works in a similar style or genre as the licensed sound effects. The Licensee shall not use, reproduce, or otherwise leverage the licensed sound effects in any manner for purposes of developing, training, or enhancing artificial intelligence technologies, nor sublicense these rights to any third party, without the Licensor’s specific and express written permission.