Well, he and his sister were almost home this weekend 5 - 6 August 2023 and just over the border!
Reference today's "The Nation" (source Phnom Penh Post) 6 August 2023.
In a surprising turn of events, former Thai Prime Minister Thaksin Shinawatra and Yingluck Shinawatra attended the birthday celebrations of Cambodian Prime Minister Hun Sen on August 5. The festive occasion marked Hun Sen's 72nd birthday.
The relationship between Hun Sen and Thaksin dates back to 1992 when they became God brothers. They have maintained a close connection ever since, even though Thaksin and his sister Yingluck were both ousted from power through coups. The unexpected attendance of the Shinawatras at Hun Sen's birthday adds a new chapter to this intriguing political relationship.
https://www.nationthailand.com/thailand/politics/40029982
Intriguing indeed! Will Hun Sen become the new PM of Thailand whilst his son is PM of Cambodia??? (only joking)
Now we know how possibly easy it was for them to "escape" from Thailand.