I'm pretty sure archive.is is safe... Yes, there's been some weirdness between them and Cloudflare, but nothing security related.
Thank you for the explanation. The original article is certainly not paywalled in my jurisdiction, hence the consternation, at using an alternative source.
Do you use Cloudflare's 1.1.1.1 DNS? (Firefox does so by default if you live in the US, see network settings at the bottom of about:preferences) It can't resolve archive.is because 1.1.1.1 doesn't support ECS.
Yes, I do. I was not aware of the implications. I appreciate the heads-up. I have now educated myself. Thank you.