Adult Content Creators

My YouTube channel was terminated without any strike:

"We wanted to let you know that our team has reviewed your content and we don't think it's in line with our Community Guidelines. As a result, we've age-restricted the following content [...]"

...But then I was not able to access it again.

Was it old?

I have 1 strike but it is not so easy for me to understand the difference between what is truly acceptable to upload and what not...