No they aren't. The TOS and similar clearly spell out that they have automated checks for malicious content, copy-righted works (remember when Google drive was a popular piracy vector for a hot second?), CSAM, etc. It's not Google's fault you haven't read that, or that you are taking a support article about sharing docs with other people and incorrectly extrapolating that to the internal technical functionality of google docs. The very next sentence after talking about end to end encryption:
>Your Google Account comes with built-in security designed to detect and block threats like spam, phishing and malware. Your activity is stored using strong industry standards and practices.
What has likely happened is that one or some of those domains probably got hacked and are pushing malicious JS or something triggering Google to view them as malicious, so some security product looks at a spreadsheet full of "malicious" URLs and it got sent into the void for that.