I don't believe this is true. You are taxed income tax based upon the cash value of the crpyto (as of the moment of transfer) paid by your employer. Your capital gains or losses are calculated based upon that price and the price at trade or sale. Short term capital gains taxes are paid if you sell or trade within 12 months, long term if over one year.
If I give an employee Bills tickets, large gift cards, a vehicle etc - they claim the cash equivalent of the tickets on their income taxes - crypto would be no different.