We as a species make up terms on a daily basis, so I feel the liberty to do the same. Glad it doesnt give any results because it indicates original thought.
If large parts of the supply chain consist of suppliers (vendors) on the other side of the earth, one can focus on one vendor lock-in or one by one (for analytical purposes) and optimise for that but often the bigger picture of a complex supply chain is missed.
Hence the aggregated lock-in.
But to avoid futher confusion maybe supply-chain lock-in is a better term and yields searchs results.
Only thing I claimed was you missed the point of SomeAmateur, meaning one can understand global supply chain AND worry about depending on foreign entities using it in geo-politics, so mentioning counter measures (make some stuff ourselves for a change) is reasonable. I am wrong all the time by the way, I just adress a lot more in my comments which you choose to ignore. But alas, you are free to pick and choose just like everybody else.