Google translator ClientLogin not supported

Documentation for both DV 6.3 [1] and teiid 9 [2] says "Authentication to your google account may be done in two ways. ClientLogin (requires login and password) or OAuth...", however only OAuth is supported already - SpreadsheetConnectionImpl.java throws exception for method other than OAuth with message "provide_auth=Only OAuth2 is allowed for the AuthMethod."

[1] https://access.redhat.com/documentation/en-us/red_hat_jboss_data_virtualization/6.3/html-single/administration_and_configuration_guide/#Google_Spreadsheet_Data_Sources
[2] https://teiid.gitbooks.io/documents/content/admin/Google_Spreadsheet_Data_Sources.html