Can somebody help me about the 144h Visa free regulation for German passholder?

From 10th to 15th March i plan to stay in Shenzhen to meet some business friends.

My flight table will be as folowed:
07 March with Thai Air from Fra to Bangkok.
10 March then with Air aisia ​​from Bangkok to Shenzhen.
on March 16 at 00:15 from Guangzhou to Frankfurt with a stopover via Dubai (transit).

So country A and C are different.

Do you know if this is suitable for the visa free 144 entry?