No, this is certainly a very valid question to ask. And I think, while this forum is about humane tech, it is also about how to introduce it in society and get real broad adoption of it. I am also in favour of broadening the foundational basis / mission of this community.
Greying out your screen - while probably working - will only be done by people that already recognize the issues and are prepared to actively work to improve them. You can compare them to environmental activists - a very small group, while most of the world, knowing the problem, still live unsustainable lifestyles.
Whatever the solutions that the Center for Humane Technology will provide they will probably be based on a combination of all tools and methods that are available. Using more tech to get us to meet in real life, less hooked. Using less tech, where this tech is negatively influencing us, and like @geo says: providing enough motivation not to move to other “colorful” stuff that is out there.
It will be so hard to achieve that last point, and convince/stimulate “the masses” to change their ways. We are in an exponential tech revolution right now, where every tech company - not just the biggies - is throwing new inventions at us in a race to compete, gain market share and go for the big bucks.
I expect social credit systems to become more widespread - not just in China - and with that more real-life things to be replaced by tech, like cash money. We get the robot and AI revolution, which only just started and will be hugely disruptive.
So, I would say: Less tech? YES! and use tech to achieve that, where needed 