That error screen looks like a Cloudflare error page, and the error makes me think they might have Geoblocking enabled?
I’m in the EU, and i’m able to access the site. Netlify Functions run in the US by default, so maybe that’s blocked? If you’re on a paying plan, you could try moving your Netlify Functions to a different datacenter, see Optional configuration for functions | Netlify Docs. Alternatively, you could try moving this scraping logic to Edge Functions - that way it would run close to the user-agent you’re requesting it with, which might be in a non-blocked geolocality as well!