It may look that way.
However, the 5010 went EOL beginning of 2019. That means 2 years later (31.07.2021) it is going EoFS (End of Feature Support). Until that time you can get ThinOS 8.6 updates.
And, of course, you can easily use 5010 with ThinOS 8.6 way longer if you like.
Although I really loved to see ThinOS 9 on older devices (and a lot of other customers also requested that), this is how it is.