At the same time Israel was releasing Palestinian “prisoners” (largely children and largely imprisoned for petty crimes like throwing stones) they were capturing and imprisoning from the West Bank (where there is no Hamas) roughly the same number of people as they were releasing in Gaza.
That doesn’t really matter though. The point still stands regardless of if it’s explained by money literally disappearing into a hole or huge rounding errors and inefficiencies in their accounting systems.
They are still allowed much much more leniency with much larger amounts of money (aren’t they aren’t ever properly held to account for it) than regular people are allowed with comparatively tiny amounts of money.
Because the measures that economists use to measure the economy are not relevant to regular people. GDP tells you nothing about living standards.