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You keep using this word "fallacy". I don't think it means what you think it means [1]

(a) a deceptive, misleading, or false notion, belief, etc.: That the world is flat was at one time a popular fallacy.

(b) a misleading or unsound argument.

(c) deceptive, misleading, or false nature; erroneousness.

(d) Logic. any of various types of erroneous reasoning that render arguments logically unsound.

[1] to paraphrase "The Princess Bride"

This usage fits definitions a, b, and c. This very definition draws a distinction between a 'fallacy' and a 'logical fallacy'

>This usage fits definitions a, b, and c.

No, it doesn't.

Government: - "We will use data just for medical purposes"

Government (later): - "Guess what, we lied/we recant: we will use them for other state purposes too".

There's nothing fallacious in (a), (b) or (c) way about either statement or the whole situation.

It's a brilliant example of doublethink you did there.