Like other Xenopod weapon attachments, "Electro Spores" gives +1 to Attack, but the card does not state that it does confer a +1 to Attack.
The player believes that the +1 is needed (and maybe came in a patch), so that "Electro Spores" can attempt to be competitive with the Tech Research attachment "Death Rod" (+1 to Attack and Energy Weapons 6). Though the player still believes that "Death Rod" would be built over "Electro Spores" unless there was a constraint on Tech research or material resource.