Not trying to be pedantic but where do you see this? I do not see the SE even listed in Apple's refurbished store anymore and I am struggling to find any documentation or evidence suggesting it is available thru Apple authorized resellers (no inventory I can find at ATT, T-Mobile, Verizon, etc)
FWIW I've been using a 2016 SE since... 2016, and I bought a spare one from Apple's refurbished clearance in 2019 when it became clear the phone would no longer be available outside ebay/grey market. If it's been silently available this whole time at any authorized seller that'd be huge news to me.