457b--is it an Individual Retirement Arrangement?

I want to know if I can make a Qualified Charitable Distribution as part of the Required Minimum Distribution from my 457b. The IRS Retirement Topics on RMDs says RMD rules apply to 457b plans. In the 590B publication it says 457b plans are "deemed IRAs". And the A in IRA means BOTH Arrangement and Account. Old articles I read from the internet (including Intuit)  from 2019 said that QCDs could not be made from 457b plans.

 

If the answer is no, can someone please tell me WHY? Traditional IRA contributions are not taxed until retirement and its the same for 457b plans. Why would there be a difference?

 

Inquiring mind wants to know the deets. Any help would be appreciated.