It says exactly that. It's written in Guile (which is inconsequential until it reaches the second part) and can take Scheme code as configuration file (which is very interesting).
Oh yes I would, but since when was this website only available to the HN community? It is full of mysterious pages like this...hardly making free software accessible.
It certainly isn't likely to make me question the choice I made to use the cron that my distro came with.