If an economy grows at 2% and the supply grows by 1% it is in permanent deflation. For a country like el salvador with much higher growth, the deflation can easily be much higher
Bitcoin's supply doesn't become inflationary or deflationary "structurally" based on the growth of x or y economies. The word inflation is used for both concepts but, structurally, Bitcoin will remain an inflationary system until around year 2140... then block subsidies are going to to stop, no new bitcoins are going to be emitted and then you (or more likely our descendants) can call Bitcoin a structurally deflationary money. Hence the use of the word disinflationary, it currently is in the process of becoming a deflationary system by progressively reducing the inflation of its own money supply (through "halvings" approx. every 4 years).