That’s not true - I have just tested it on Evergreen with provided charger and it works. I had to boot with modem and WiFi turned off via killswitches, but could enable them back afterwards after fully booting. Then I could even play a game and use cameras with modem and WiFi both connected, all without a battery.
You need a PD charger that can negotiate enough amperage on 5V. The provided one goes up to 3A, which is sufficient. With non-PD chargers the current limit will be set to 500mA, which is not enough.
The negotiated current can be checked with cat /sys/class/power_supply/tps6598x-source-psy-0-003f/current_max