To answer your question directly: No idea.
Of tangential importance to your question: Apparently TPB has been considered untrustworthy for a number of years, probably since it "returned" after the original crew behind it did a stint in Swedish prison. Infected torrents have been found there and the "skull" ratings mean very little.
It show me a cloudflare error, it seems down. But there are gazillion other torrent sites, my general goto is 1337x.
I've seen warnings like that when a sites certs expire. Well maintained sites don't usually let that happen, but I've seen it plenty for torrent sites. It's usually fixed in a few hours or a day.
Like others said, it could also be the ISP, so you can try a VPN, even a free one would probably do, if that was the issue.
You can also try resetting cached data for that site specifically. How to do that is different per browser, search online for more info specific to your browser.
No https problems for me.
It might be your ISP trying to block it. I'm surprised they're not using HSTS to force HTTPS.
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