Of course inflation is permanent. The mechanics of money would break down otherwise. When money can deflate, money becomes an investment vehicle like crypto did and we know how bad that is.
When there is a threat of inflation, it forces people to transfer money instead of hoarding it. That is the entire purpose of money.
Now, about the price hike… is it permanent? Probably not when there are 160,000 competing poultry farms.
Not exactly the strongest counterexample I've ever seen, though (barely) technically correct.
And the last deflationary "period" (a single year) before that was ... drumroll... 1949, following 3 years of >8% inflation.
0. https://taxfoundation.org/historical-income-tax-rates-bracke...
1. https://www.taxpolicycenter.org/taxvox/effective-income-tax-...
On average, aka the vast majority of tax revenue, it's stayed constant according to your own source.
Food, electricity, heating, all went up from minimum 30% to nearly doubled. Luckily my rent and doctor's bills went up only 10% so thank God about that.