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> This is a strategy copied from China. They did same in 1970-80's.

Citation needed.

USSR did that quite a few times. They'll invalidate existing bills and you would only be able to exchange a few of those.

Do this enough times and people will rightfully call the local currency "wooden", and switch to USD for any large transactions.

Rouble also became worthless in the following years, Venezuela-style. Accompanied by Venezuela-like poverty.

India did this once already . 1978 - all denominations gt than 100 INR were demonetised

That does not sound like a secret plan sprung on the people with surprise.