I suspect the latter @greywolve , but not certain and this channel seems to be very low traffic.. so not sure if it still gets used a lot.
and I don't think that immutant is that popular... If I were to start a new project for instance I'd have a look and see if Yada would be suitable for me.
Immutant is a web-server while Yada (and Reitit and others) are web libraries that are run over a web server. Yada uses Aleph.