is it impossible to know a Wifi mac address of an android phone via a link?
An IP logger captures the IP address and the browser user agent string, the browser user agent only contains information like phone model and browser, no uniquely identifying information like MAC addresses.

So no, this iplogger (or any other that uses similar techniques) cannot determine if the phone is actually your's, only if it is the same model, but thousands of that model are sold so that is not considered evidence.