I don't know why this was flagged, but you are right.

Google Docs [1] and OnlyOffice [2] also employ the canvas method to render office documents, and have found it reliable and consistent among different browsers.

[1]: https://workspaceupdates.googleblog.com/2021/05/Google-Docs-...

[2]: https://helpcenter.onlyoffice.com/faq/technology.aspx

The account is flagged because it's a bot account.