It is normal to get an update / build in 1-2 weeks once Microsoft establishes a cadence for the product releases. Today the .65 version came out (for those whose systems qualify ) . More often the announce comes from @Windowsinsider on Twitter. Hopefully with the new Insider site they will consider posting there first . Feedback Hub announcements have been way out of date last few months. They need to deprecate it or fix it.
I have the 2..... .1 build ( not even .51) and no, it did not come from a 'bandit' channel. At least I can test it but it will not update further for some reason. Still having issues getting a TPM module to cross that hurdle...