I have one main issue with that document, which I have seen before, and that is the following -
and then after one small para it states -
Which does not make sense to me. For a start you may not be able to lay your hands on all the "duplicates".......
If you revoke a will normally you state in the new will that you revoke any prior wills unless you are adding a codicil.......
For that reason and not being able to read Thai I have not been able to consider using that template but that's not to say it wouldn't be ok especially if you were never planning to change it.