I just tested changing user agents in Chrome - setting UA to a random string like "fff" gets a search page, but setting it to "Links" or "Lynx" gets "Your browser isn't supported anymore" - which is to say, this doesn't look accidental, but more like these UAs are specifically being blocked.
EDIT: Forging user agent in Links (with links -http.fake-user-agent) gets a usable homepage, but the results page just sends you to a turn-on-your-javascript page.
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