Voiceattack is a controller, a peripheral (albeit digital) . Like your mouse or keyboard or game glass or xbox controller.
It sends key press inputs to a computer based on your voice instead of mashing a button or clicking a key or pushing the trigger.
This made me remember a issue with Trackmania. Some company released a keyboard that could be programmed, some youtuber used the keyboard programmed in a way that gave him a minuscule advantage (game has some built in precision modes, but the keyboard made it easier/more granular) but the Trackmania game still supported the effect given by the keyboard, people cried out (only later learning about the keyboard), Trackmania devs came forward saying "we won't allow further usage, but we recognized it wasn't used in bad faith, so we're only removing the records with it" (I think the youtuber talked to them before asking for clarification, which prompted the devs response), then Trackmania devs implemented some new precision modes that implemented the advantage that the keyboard reproduced but for everyone.
Controller or not, as already stated, the ToS is clear in that FDev has drawn some lines in the sand, and they can move them as they see fit. Them partnering up with voice command creators and giving them tools legitimizes the voice command creators, but doesn't change the later: they can act on that. The game doesn't have a single input "request docking permission" or "target powerplant" button, and when any tool implements something that doesn't exist on the game, it's automating something (therefore, breaking ToS). The whole "several actions in one" is poor explaining, because several is more than one but how strongly you feel at the higher than one changes from person to person and from situation to situation.
Elite isn't competitive as Trackmania, so I don't expect FDev to clash hard on automation outside of BGS manipulation. Specially if it involves talking to your ship, which invokes nice fuzzy feelings of sci-fi and "my ship computer is my friend", things that are tangential to Elite's design. FDev won't shoot its foot saying "no flirting with your ship", so voice commands will either be ignored by them or regulated as people cry out (IF they do).
TL;DR: They break FDev's ToS. They are good for the game. FDev can break FDev's ToS. FDev will allow them, breaking their own ToS AND abiding by it at the same time, because they are good for the game. Specially because the alternative is spending more development resources and legal resources extending the ToS to cover third party tools limits and/or implementing in-game macros to limit how much automation players can do by simply saying "you can automate what the game allows you to".