If you turn the “Tumeng linkage” off (located in account settings, under “Linked services”), you will remove the link with Tumeng.
If you remove the link with Tumeng, all work posted there as well as the linked account will be deleted. This includes all related data. Please note, however, that once you unlink your account, all previous data from the posted work will no longer be available.
If you link your account once more, all previous data shared with or posted on Tumeng will remain deleted.
Additionally, when you withdraw from pixiv, all shared data will be deleted in the exact same manner.