There is a link to the schematic on the bottom page of the wiki.
I believe that the LiPo battery has low internal impedance and can supply more than the 300mA peak current required by the ESP32C6.
If you use an external regulator, you will need a fairly large capacitor that can supply the 300mA peak current.
edit:
Whether there is a problem with LiPo battery connected to the 3V3 pin and also powered by USB-C should be carefully considered.