I just can't understand how this attack can be implemented in real world, it not only needs having an adjacent network access to the VPN client but most importa

I just can't understand how this attack can be implemented in real world, it not only needs having an adjacent network access to the VPN client but most importantly knowing the destination of a currently open TCP connection encrypted by the VPN and then guessing the right sequence numbers. Since most TCP connections are also carrying TLS these days, this attack is pretty useless in the vast majority of real world situations I can think of.