This commercial use pack is released under a no-attribution, no reselling license. This means:

You can use, modify, and share these assets as much as you'd like in any
project that you charge money for or use commercially - and you don't
have to mention where you got them. (But I'd appreciate it!) You can
alter and modify these assets however you'd like, but you can't resell those base or modified assets.

For example: You draw some lava on these tables. Now they're lava tables.
You can use those commercially as much as you want within your maps or
projects - but you can't resell your modifications as individual or
packaged assets themselves.