9:54 AM PT -- Whether Tom Brady believes the relationship timeline between Gisele Bündchen and Joaquim Valente or not -- they're continuing to see each other as they explore their romance ... proven by the fact that Joaquim just left Gisele's place earlier this morning.

Here's a shot of the jiu-jitsu instructor making a clean getaway from Gisele's home in Miami Wednesday morning -- right on the heels of reports that they're together as a couple now. Tom himself might be incredulous as to when it all began ... but they clearly don't care.

Gisele Bündchen didn't start dating Joaquim Valente until June 2023, but apparently Tom Brady isn't buying what she's selling.

Multiple sources connected to Tom tell TMZ ... the former QB believes G&J started dating long before that. As one source put it, "They should add 2021 after June. Then the headline would be accurate."

Gisele sources told People, "They have been dating since June. They're taking it slow. They started out as great friends first."

As we reported, Gisele and Tom have known Joaquim for years. Their 2 kids took jiu-jitsu lessons with him and Gisele herself trained with Joaquim.

After Tom and Gisele split, she traveled several times to Costa Rica with Joaquim, along with her kids and have been seen together in Miami as well.

One source said, "When they announced divorce in October 2022, Gisele fled to Costa Rica for 2 months. Joaquim flew there with her for 2 months. She takes her jiu-jitsu training seriously. LOL."

Tom has been dating supermodel Irina Shayk on and off since last summer, so he's moved on. The couple shares joint custody of their kids.