The esp32 code shown in this makernote works without fail on the same Tab5 device.

my platformio.ini:

[env:esp32p4_pioarduino]
platform = https://github.com/pioarduino/platform-espressif32.git#54.03.21
upload_speed = 1500000
monitor_speed = 115200
build_type = debug
framework = arduino
board = esp32-p4-evboard
board_build.mcu = esp32p4
board_build.flash_mode = qio
board_build.partitions = default_16MB.csv
board_build.filesystem = spiffs
build_flags = 
	-DBOARD_HAS_PSRAM
	-DCORE_DEBUG_LEVEL=5
	-DARDUINO_USB_CDC_ON_BOOT=1
	-DARDUINO_USB_MODE=1
lib_deps = 
	https://github.com/M5Stack/M5Unified.git
	https://github.com/M5Stack/M5GFX.git

Other Arduino stuff is broken too: after wakeup from lightsleep the display does not work properly half of the time: the cursor position is sometimes totally off, or sometimes it does not wake at all. I suppose the display needs a hardware reset via a GPIO, but can't find any mention of this in the docs.

But the hardware is very nice indeed. Especially the undocumented coin battery backup for the RTC is a nice surprise!