Steaming pile alert....
The elimination of income tax on profits is only ONE of the savings experienced by a business under the nrst. Don't "forget" that ALL suppliers have also experienced an elimination of THEIR income taxes too.
Using your logic if there are enough suppliers we can get it to 100% and beyond.
A 20% reduction by 5 suppliers is still only a 20% reduction...not 100%.
This is unrelated to your claim.
Don't try to weasel out, it's related to your claim of price reductions.