You are correct that the Teradata JDBC Driver does not support FastLoad checkpoints when using a TYPE=FASTLOAD connection.
However, that is a separate topic from TDCH's internal.fastload feature supporting FastLoad checkpoints.
TDCH's internal.fastload feature could be enhanced to support FastLoad checkpoints independently of the Teradata JDBC Driver's TYPE=FASTLOAD connections.
If you are a customer, and you have a business need for TDCH's internal.fastload feature to support FastLoad checkpoints, then you should submit a feature request using "Teradata At Your Service".
You are correct that the Teradata JDBC Driver does not support FastLoad checkpoints when using a TYPE=FASTLOAD connection.
However, that is a separate topic from TDCH's internal.fastload feature supporting FastLoad checkpoints.
TDCH's internal.fastload feature could be enhanced to support FastLoad checkpoints independently of the Teradata JDBC Driver's TYPE=FASTLOAD connections.
If you are a customer, and you have a business need for TDCH's internal.fastload feature to support FastLoad checkpoints, then you should submit a feature request using "Teradata At Your Service".