Currently 1.16.1 When Forge is out as an alpha. As such under the current CF policy mods will not be shown to launchers that can build packs. When Forge leaves alpha the cf api will update and mod browsing will be possible in the launchers.
Turns out this policy also affects (yes affect) Fabric mods. I realize that someone probably doesn't want Fabric to get more notoriety than it already has, but the fact is Fabric is on the latest snapshots well in advance of the Forge team having a beta release of their launcher for each tier.
This does NOT stop players or pack devs from manually downloading the mods and installing them in their launchers. The launchers even auto detect the mod at the point and will update them too.
Hiding mods on Alpha Release Forge builds seems counter intuitive.
I recommend changing the policy about this such that when Forge releases the cf api allows mod browsing via the launchers.