UK person here - my concern is that the opposition haven't clearly stated that they would repeal the law if they were voted into power (to my knowledge, I'd be delighted to be corrected on this front!)
So letting voters know about it is great but if none of the main parties are actually against the law coming into effect - which is being sold as an anti-paedophile/child abuse measure, which framed like that would be popular with a lot of non-techy voters who don't trust an unregulated internet - a few little messages saying 'yay encryption!' aren't going to do anything.