I read it the same way as achimsmile, I think a comma/fullstop/words were missing in your rush

"Around 20% would be quite a lot, or if I may say, with the current total amount of stake forging
. So around 23% of stake would give you a shot at a 51% attack
as there is about 45% of the stake forging at the moment."
I think ^ is what you meant. But it read as though only 23% of people were forging.
Isn't this more or less exactly what's expected? You need around half of the total staking power to attack?