Look up your exact Chromebook model on the MrChromebox site. If it lists "Rammus" as the board ID, you are good to go.

To be precise, "Rammus" is not a version of Chrome OS (like version 89 or 90). is the code name for a specific Chromebook reference board (motherboard) designed by Google. What is "Rammus"? In the Chromium OS development world, every piece of hardware gets a code name. "Rammus" is the code name for a reference design for a Chromebook that uses an Intel Kaby Lake processor.

It's just the internal hardware identifier. Nothing to worry about.