Received W2C for TAX YEAR 2019 in Jan 2023

Hi, 
I received a W2C for the Tax Year 2019 from my prev employer in the year Jan 2023. 

However I mistakenly forgot to file it.

What are my next steps ? 

 

1) Whats the normal Process to file a w2c for a Previous Tax year ( almost 3 years back in this case)? 
2) I spoke with Turbo Tax experts and they mentioned that I need to Amend my 2019 Taxes. But since its more that 3 years, I cannot and should not worry about it. Is this a true statement ? 

3) What are my options ? 
4) Now my prev employer is asking me to send the form 4669 to make sure I filed my w2C.