Where the limitation of VPC attachments comes from?

[yyamano]

https://github.com/mulesoft/docs-runtime-manager/blob/latest/modules/ROOT/pages/tgw-attach-arm.adoc says:

One transit gateway can support up to 10 VPC attachments.

Where the limitation comes from? Is it a limitation of Anypoint Platform?

https://docs.mulesoft.com/runtime-manager/tgw-about#limitations seems to describe the limitation comes from AWS.

The following values are governed by AWS limits:

• Maximum number of transit gateways per VPC
• Maximum number of VPCs that you can attach to a transit gateway

For information about limitations when attaching a VPC to an AWS transit gateway, see Transit gateway attachments to a VPC in the AWS documentation.

However, attachments per transit gateway is 5000 in the AWS documentation, not 10.
I'm confused.