Interesting that the last item in the list (copied from the original article) says legal services are not permitted by foreigners, yet there are definitely foreign lawyers working here, in Bangkok, Phuket, etc. and have been for years.
Occupations completely restricted for foreigners:
Wood carving
2. Motorcycle driving, excluding forklift operation
3. Auction
4. Gem cutting/polishing
5. Hairdressing/beauty salon services
6. Hand-weaving fabrics
7. Loom weaving or manufacturing using straw, bamboo, chicken feathers, yarn, etc.
8. Handmade paper production
9. Traditional lacquer making
10. Thai traditional musical instrument making
11. Thai niello making
12. Gold/silver/platinum smithing
13. Stone carving
14. Thai doll making
15. Alms bowl making
16. Hand-woven silk fabric production
17. Buddha statue making
18. Paper/fabric umbrella making
19. Agent/broker services
20. Thai massage
21. Cigarette rolling
22. Guide services
23. Street selling
24. Thai alphabet arranging services
25. Silk thread spinning
26. Secretarial services
27. Legal services