"blog.kowalczyk.info uses security technology that is outdated and vulnerable to attack. An attacker could easily reveal information which you thought to be safe. The website administrator will need to fix the server first before you can visit the site.
I don't know what tool you're using to determine this, but it'll say the same for half of the internet as my site is hosted on render.com and proxied via cloudflare.
No repro on either my work or home computer, both of which are Firefox 100. The certificate shows an encrypted connection using TLS_AES_128_GCM_SHA256 with TLS 1.3.
"blog.kowalczyk.info uses security technology that is outdated and vulnerable to attack. An attacker could easily reveal information which you thought to be safe. The website administrator will need to fix the server first before you can visit the site.
Error code: NS_ERROR_NET_INADEQUATE_SECURITY"