Absolutely no evidence to support this currently other than an image and recirculated by a 'superfan'.
Should information change - the post & title will be edited to reflect said.
Can I stress again: currently only a rumour.
Anyone with information either way, please add below.
Update (June 19, 2023:
The concert on the 10th is confirmed by Morrissey Central.
MESSAGES FROM MORRISSEY on MORRISSEY CENTRAL
- Morrissey Central: "SOUTH AMERICA" - April 14, 2023