I would like to understand how it is possible to get that quantity of keys. It is something of really amazing

As I read, this software scan 1exakey/s with your hw?
this is not 1 ExaKey/s this like 1 Exa Compares per seconds
if you have 4 Gkey/sec generated on rtx 3090 and check via bloom filters for example 238M public keys per seconds,
you have 1 000 000 000 000 000 000 compares like 1 Exa Compares per second
1 Exa Compares per second but only for generated 4 Gkey/sec