Does jwt.io load public keys automatically at runtime?

JWT.io
1

Hi! Does jwt.io load public keys automatically at runtime as described in the topic below?
It doesn’t work for my custom implementation.
How is JWT.io able to validate signatures

2

My JWT:
eyJhbGciOiJSUzI1NiIsImtpZCI6IjAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwIiwidHlwIjoiSldUIn0.eyJpc3MiOiJodHRwczovL3BsYXlpZC5vcmciLCJhdWQiOjAsInN1YiI6ImMyZDdjZWZmYzg3ZDQ3ZTBiYjYzMDFiNTFkOGFmNmJlIiwibmFtZSI6IkhpcHBvIEdhbWVzIiwiZW1haWwiOiJoaXBwb2dhbWVzdW5pdHlAZ21haWwuY29tIiwiaWF0IjowLCJleHAiOjAsIm5vbmNlIjowfQ.FQulWNkJE_fv1KZrCn8hjAMpY0zWkkx0i0kShuHfOI3DCUHy38dWKsPFul4iNDlklZf22XZGqGlopXh1PY6NDd75C0jnxxMxYImIAX6Nedrwg8ClF0X1a1_sGyhO6YEIJNWbJOgX2LAGec_i_2DBCMEmN0cD-QazxVI6Ee_xl5M

https://playid.org/.well-known/openid-configuration
https://playid.org/.well-known/jwks