How do I search for specific episodes in a podcast feed?

[#1]

I'm searching a podcast feed for an episode that dropped 3 years ago. This podcast is daily and has been posting for years, but the results from manually scrolling their feed stop after 1.5 years, and even searching key terms and the exact episode title are not bringing up any results. I've tried this across several devices: on Android, on the desktop for Mac, and in the web player. FWIW, I'm a professional podcaster trying to update my portfolio, and it's incredibly frustrating to be unable to search for old episodes in the current UX.