The [FAQ page] answers this:
> Slow Ways walking routes – drafted, tested, reviewed and verified by volunteers – suggest the best ways to get between neighbouring towns, cities and villages. Our mapping and routing will show a limited number of paths, making it easier to see and plan journeys.
— curation.
[FAQ page]: https://slowways.uk/frequently-asked-questions/
What I find more surprising is announcing such a project if there is no result yet, now they get buzz and create disappointment and I don’t see what they gain for it.
The map visible is from the first draft. I don't know why they haven't released the first draft, but it could be that they don't want to release potentially unsafe routes. The pretty website is designed to entice volunteers, which is why "Up for helping us?" is front and centre. It led me to sign up.