From the linked GitHub webpage:
All builds are experimental, so unexpected issues may occur. Helium Browser for Android only attempts to improve security and privacy where possible. For better protection on Android, you should instead use GrapheneOS with Vanadium, which additionally integrates patches into Android System WebView and provides significant kernel and memory management hardening on the OS level.
I wouldn't recommend browsers in an experimental state developed by a single person; this is partly why I don't recommend Cromite.
The original Vanadium is great, but the lack of proper content-blocker integration is a big privacy trade-off, in my opinion. Vanadium only provides a per-domain blocker solution, which is based on the very small EasyList.
A good Chromium-based alternative is Brave, as it has a solid content blocker that attempts to recreate the full feature set of uBlock Origin.