provided the license agreement is followed
As I wrote.
You also talked about putting disclaimers on your work that might violate the license.
Copyright and Software licenses are related but not the same. You have copyright without using a license. But the particular license you are forced to use by publishing on Scratch gives anyone so much rights that for many intents and purposes you have no copyright - provided they follow the license rules. Because you literally cannot hinder anyone from copying your stuff.
Hitting the repot button on a page with "Uploader not authorized to distribute" is one thing. But going through the actual dmca process another. If you need to do such things, make sure, it is the correct legal tool.
Since the pages were taken down, the immedate "takedown" already took place. Remember, the people talking here are not lawyers. Legal consultations cost money. It is personal opinion and observations you will get here. You wanted the copy down, it is down. The actual dmca takedown is for situations when someone refuses to take it down.
So good luck with getting on top of google again. But the license you are using will not prevent this from happening again should the license be followed, to get on topic again.
One can attribute a project on Itch with a license, but it might be that this particular license is not allowed on Itch - for a game. Assets can have some of those cc licenses and you can say that a game you have has assets with a cc license and you are probably required to, hence the possiblitly to attribute those licenses.