The asset you want, Post Processing Stack, does not have such restriction, while some others do, such as Windridge City, Melodrive Lite Beta or ADAM EP2/EP3 - Alembic Timeline Sample. Yes, you can use any assets you acquire from the asset store freely in your commercial projects without crediting the author. You can see a couple examples searching via Google. Searching around, you'll notice that the restriction is written in the asset description. Since there is no 'license' sections on these Assets Store pages, it's a bit hard to know at a glance which one is a Restricted Asset, and which one is not. They are intended for educational purposes, whilst they are free, I do recommend you spend time changing them to make them look original. The only thing is, the standard Assets are well known in the gaming community. This means that Restricted Assets can't be used in your commercial game, while others can, paid or not. You can use any free Unity made Asset in your commercial game. No other use is permitted, and these Unity assets must not be used in your commercial games. These are only valid for personal and non-commercial use only. Unity 'Restricted Assets' are subject to restrictions that others are not. Now, as you mention Restricted, so here is what is says about restricted:

You will be able to use them in your game for commercial use with no extra payments. Once you have purchased an asset from the store, it becomes yours to do with as you like within your games and apps. You can purchase assets from the Asset Store and use them personally and commercially in your game. Re-reading the page you linked to, we can see that you can use the assets from the assets store in a commercial game.

Unity free assets commercial use