Your route ends with Data/ in the declaration,
but with Data/LoRa in your request.

Try to change the webroute to @webroute(GET, '/Key/<key_val>/Data/LoRa')
or to @webroute(GET, '/Key/<key_val>/Data/<page_name>')
or change your request.

I must of miss copied but my route is:
@WebRoute(GET, '/Key/<key_val>/Data/<data>')

It does not recognize it with the request:
GET /Key/DATA_UPLOAD_METHOD/Data/LoRa

Ah ok.
Check if this change fix it for you:
in file "webRoute.py" on line 57

                    regex += '/([\\w.]*)'
                else :
                    regex += '/' + part

remove the [ and ] like so:

                    regex += '/(\\w.*)'
                else :
                    regex += '/' + part

It seems, there is a bug in lib re (RegEx) on micropython(ESP32, others not tested).
Maybe somebody knows more, but this is the dirty fix, that works for me right now.

This fixed for me. Thanks