This is true but it's also true in this instance that the adversary was already antagonistic and was moving towards self-sufficiency at their own pace while using your technology to do so.
The reasoning behind cutting them off through the methods you listed is to force them to move to self-sufficiency on your terms without as much access to your technology.
I'm not sure what technology you have in mind here. Correct if this is wrong, but China has required for transfer of technology when some business wanted to produce on its territory and has produced basically everything we can think of under the sun.
As the famous roll pen examplify, China can definitely make high tech products and it's more a question if economical relevance whether they will intensify in that direction
The reasoning behind cutting them off through the methods you listed is to force them to move to self-sufficiency on your terms without as much access to your technology.