This is slightly off. It's actually a bit higher than 1.25%. What happened is this. When the airdrop was first announced, it was going to be 25M CHF, which was stated to be the 1.25% of DFN tokens. This implied a valuation of 2B CHF. However, the airdrop was later increased to 35M. DFINITY never actually announced what percentage of the total supply the 35M airdrop is, but you can do the math yourself if you assume a valuation of approximately 2B CHF.