No, it is not, it is up to 5k and up to 200 a day until the fine is paid.
Section 76
Any alien, who fails to comply with the provisions of Section 37(2), (3), (4) or (5) shall be punished with a fine not exceeding 5,000 Baht and with an additional fine not exceeding 200 Baht for each day which passes until the law is complied with.
https://library.siam-legal.com/thai-law/thai-immigration-act-penalty-sections-61-84/