No, an ESP32C3 is available in the standard platform. E.g.,
[env:seeed_xiao_esp32c3]
platform = espressif32@6.8.1
framework = arduino
board = seeed_xiao_esp32c3
And just to also have that documented in this thread too, forks like https://github.com/pioarduino/platform-espressif32 and https://github.com/Jason2866/platform-espressif32 (<-- Tasmota uses this!) do provide support for the latest Espressif chippies and Arduino-ESP32 3.x. For example, ESP32-H2 chips.
[env:esp32-h2-devkitm-1]
platform = https://github.com/pioarduino/platform-espressif32.git
framework = arduino
board = esp32-h2-devkitm-1