I think Deep Trip went way overboard on the filtering, but it does no harm. Just like you can't put too much water in a nuclear reactor, you can't put too much filtering on the power rails. Maybe Deep Trip's basement garage yurt lab had a really noisy power supply.
While we're critiquing the BOG design, what's with the two 100K resistors in series? Or the 12.4Ω resistor in series with the BIAS pot?
At my first job out of school, I learned a term from the Sales Manager: "Apparent Value." It means if you make it a product look like it's worth more, people will pay more. I suspect that's what all of the extra parts are about. Back in the old days (Fig will remember this), transistor radios proudly advertised the number of transistors inside. Obviously, a 10-transistor radio is better than a 6-transistor radio. Nevermind that four of the transistors on the board were not in the circuit.