... This isn't quite accurate... An SSL labs server test,
https://www.ssllabs.com/ssltest/analyze.html?d=ffmpeg.zeranoe.com
reveals that the hostname resolves to two IPv6 and two IPv4 addresses (4 in total); selecting, for example, the first IPv4 one (104.24.105.227) :
https://www.ssllabs.com/ssltest/analyze.html?d=ffmpeg.zeranoe.com&s=104.24.105.227
... one can see that the site supports even TLS 1.0 (which is why it is capped with a B mark):
However, you are right in saying that the site can't be accessed on XP with browsers that rely on the OS crypto libraries (like IE8/Chrome 49), and this is reflected on the test site as well:
------------------------------------------------------------------
Handshake Simulation
Chrome 49 / XP SP3 Server sent fatal alert: handshake_failure
IE 8 / XP No FS No SNI Server sent fatal alert: handshake_failure
------------------------------------------------------------------
... however this fact is purely because:
=== This site works only in browsers with SNI support ===
SNI requires Vista at minimum; FWIW, I can load the Zeranoe forums site with IE9 on my Vista SP2 laptop...
OT: I hope you're all well and staying safe, away from Covid-19 infection...