Of course, even if Grand Mole had been summoned, the Hate Buster was set in Yubel's field at the time, so even if Grand Mole had been summoned, there would have been no change in the result, but this is only a consequential story and cannot be a reason for Judai not to summon Grand Mole
That's not going to work
However, the original effect was immensely powerful in the Gouki deck, and Firewall Dragon's powerful status as a boss monster allowed that deck to be meta in 2018
#14: Exodia Look, if you were lucky enough to have all the pieces, you played all the pieces
If this card is sent from the hand or field to the GY as material for the Link Summon of a "Code Talker" monster: You can either add 1 "Cynet" Spell/Trap from your Deck to your hand, or, if this card on the field was used as material, you can add 1 Level 4 Cyberse monster instead