I am located in Europe, but I am using Starlink for Internet connection so maybe it is better to use solo.ckpool.org?
No, how did you come up with this assumption? Is it because Starlink headquarters is in the U.S?

Starlink has ground stations in eurpoe, so most certainly, you have lower latency to the pool EU server regardless.
Is there a way to ping booth eusolo.ckpool.org and solo.ckpool.org and see latencies?
Sure, open your CMD and type
ping solo.ckpool.org
eusolo.ckpool.org
You will likely get above 100ms on the first one and below 70ms on the second one.
I don't use this solostats thing, so I can't tell. I think the basic status page is more than enough, and yours shows just fine, so this is probably a bug related to this specific website.