Job posting I saw today. Note the visa requirements (or lack of....), is it legal ?

Visiting ESL Teacher
China (Jiujiang, Province of Jiangxi)

12000 CNY

Requisites:

Fields of Expertise: ESL/EFL

Details:

This is for candidates who are currently in or outside of China and can free up two to
three months in October or November of this year to come for a holiday and teaching
experience at our school. Our school is in the beautiful city of Jiujiang in the Province of
Jiangxi right on the Changjiang River.
You will be like a visiting ambassador of the English language to our school. Just any
kind of a visa that you now have will do, even if it is only a tourist visa. No working visa is
required at this time for this short assignment. You will be paid in cash. Return air
transportation will be provided. A fully furnished one bedroom apartment with WIFI
situated right beside the school will be provided.
You will definitely enjoy this two or three months’ experience if you have a good heart, a
pair of free hands and the time availability.