It seems that Trisquel does not generally remove or replace anything from Ubuntu unless it is proprietary or facilitates installing proprietary software. Since systemd is free software, it will probably be present in Trisquel as long as it is present in Ubuntu, starting with Trisquel 8.
If that's a deal-breaker for you, you can either stick with Trisquel 7 for the duration it is supported (until March 2019, I think) or switch to a different freedom-respecting distro that does not use systemd. Some options include Hyperbola, Parabola (offers both systemd and OpenRC ISOs), GuixSD (still in beta), and Devuan (optionally free like Debian). It sounds like Salix is not a freedom-respecting distro. I'd avoid it.
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