None of your 100W Anker or Apple power bricks will supply this. They'll do 12V3A, 12V5A, 20V5A, but not 5V5A.
Yet another piece of nonstandard USB-C equipment.
On page 805 you find Table 10-2 SPR Normative Voltages and Minimum Currents, which specifies that a USB PD source with a rating of 15 < x ≤ 27 watts *shall* support 3A at 5V, however it *May* advertise up to RoundUp (PDP/Voltage) to the nearest 10mA. Requires a 5A cable if over 3A is advertised. 27W/5 rounded to the nearest 10mA comes to 5.4A
[1]: https://www.usb.org/document-library/usb-power-delivery
If a device needs 25W it is required to accept 9V 2.8A, if it wants to be PD compliant. This is precisely because 5V 5A is optional for a 25W source, so a device cannot rely on it being present.
I wish they had an auxilary DC power connector of some sort though that could just power the Pi on straight up + and - from a DC power supply. Ideally anywhere from 5-12V.
This is also very uncool, since powering it through the GPIO header with a capable PSU won't trigger the PD signal and makes it impossible to draw any meaningful current through USB? I hope this blockade can be worked around in the boot config.
In practice I doubt it would be a real problem since you'd need to max out both the USB draw and CPU load at the exact same time to get the full draw.