About that, is there a clickable link to access the blocked site after the warning?. This is what I mean, you access a website and blocked by metamask and you want to access the site that is already proven by you that it's not phishing link or website and then you just have to click a link or button to access the site like continue to site or something like that.
I don't think you can without disabling MetaMask. If you're using it on Chrome, extensions are disabled by default on Incognito mode. You can also use a second browser.
About the underlined "please file issue" does it take much time or not?
The report itself shouldn't take much time, but whether or not MetaMask will take action immediately is another question. I haven't tried it yet, but if you encountered an incorrectly tagged website, you should probably try to report it.