This can't be universally true. If food gets continually cheaper, unless the cost of owning land and farming it goes down by the same amount, farmers must eventually make less money than before (or be driven out of business entirely).
And I don't quite buy the comparison between technological progress (where things get cheaper due to massive amounts of competition and research) and switching to a fiat currency which is arbitrarily limited (bitcoin). Using bitcoin doesn't guarantee technological progress.
> Inflation as you are talking about it is caused by the money supply increasing. Usually due to the government printing more. Whoever gets the money first is suddenly richer, because prices haven't increased in response to inflation yet. The amount of money they have relative to everyone else has increased. Therefore everyone else has become poorer relative to them.
Yes, printing money is in effect a government tax for usage of that currency.