Support for SEEED XIAO RP2040

Has support for this board been dropped?

board = seeed_xiao_rp2040

results in

Resolving seeed_xiao_rp2040 dependencies…
UnknownBoard: Unknown board ID ‘seeed_xiao_rp2040’

at the time that I am typing this using PlatformIO 3.3.3 and specifying

platform = raspberrypi

Complete platformio.ini follows:

[env]
platform = raspberrypi
framework = Arduino
board_build.core = earlephilhower
board_build.filesystem_size = 0.5m

[env:seeed_xiao_rp2040]
board = seeed_xiao_rp2040