[2] Vaast was born in the town of Vairao on the island of Tahiti in French Polynesia.

[7] In 2023, he made his first WQS win in Morocco, at the Rip Curl Pro Search Taghazout Bay.

[8] Vaast qualified for the 2024 Olympics at the 2023 ISA World Surfing Games, defeating Spanish surfer Gonzalo Gutiérrez to claim the European slot.

[9] As a replacement for Ítalo Ferreira, who withdrew due to injury, Vaast placed fifth in the SHISEIDO Tahiti Pro 2023, behind Leonardo Fioravanti.

[10][7] At the 2024 ISA World Surfing Games, Vaast won the bronze medal, placing behind Gabriel Medina and Ramzi Boukhiam.