Of course I would be in favour of all evidence for claims being available to consumers. However, for future and forward-looking claims, I would actually be in favour of those being considered misleading in all circumstances. Companies can clearly state what they are doing in the present that will impact their future environmental behaviour. There is no need to allow future environmental claims, that, as you say, cannot be verified.
On April 11th, 2024. See this statement in context.