It doesn’t look like it. Raw:
https://cerebrux.net/2019/05/28/brave-browser-%ce%bf-%ce%b4%ce%af%ce%ba%ce%b1%ce%b9%ce%bf%cf%82-browser-%cf%80%ce%bf%cf%85-%cf%80%cf%81%ce%bf%cf%83%cf%86%ce%ad%cf%81%ce%b5%ce%b9-%cf%84%ce%b1%cf%87%cf%8d%cf%84%ce%b7%cf%84%ce%b1/
In the onebox link, this gets double-encoded to this:
https://cerebrux.net/2019/05/28/brave-browser-%25ce%25bf-%25ce%25b4%25ce%25af%25ce%25ba%25ce%25b1%25ce%25b9%25ce%25bf%25cf%2582-browser-%25cf%2580%25ce%25bf%25cf%2585-%25cf%2580%25cf%2581%25ce%25bf%25cf%2583%25cf%2586%25ce%25ad%25cf%2581%25ce%25b5%25ce%25b9-%25cf%2584%25ce%25b1%25cf%2587%25cf%258d%25cf%2584%25ce%25b7%25cf%2584%25ce%25b1/
The confusion may stem from the fact that Chrome and Firefox both display URIs as IRIs, e.g. in the address bar, for ease of reading.