KeePassXC can be synchronized to/from any public or private cloud platform using your existing sync tools specific to each platform. [1] The benefit being cloud-agnostic and avoiding vendor lock-in.
I didn't mean to say what you said was inaccurate. I clicked the link because I thought it was some KeepassXC option for cloud sync but it was just an FAQ saying you can save your vault file on various cloud platforms.
Just an additional since even KeepassXC didn't mention it.
[1] - https://keepassxc.org/docs/#faq-cloudsync