Nevermind.
I have decided not to sign any contract with them.
After discussing with all of you in this forum, I will continue my SIM only plan and already bought Huawei B818 modem as my modem.
So I can cancel anytime.
Will cancel Streamyx tomorrow.
This is the speed I get with UniFi Air, hotspot from iPad Pro 10.5.
Finally I can watch Netflix in 4K which is not possible at all using my Streamyx.

Edit: Oh I forgot to add, surprisingly the TM people help me to register this UniFi Air as smooth as possible. At first they did not allow me a few weeks ago, then after I show the speed I get with my Unifi Mobile speed, they let me. Did not ask much.
And today the TM people call me to follow up how was the speed and want to proceed with modem bundle or not, I said way faster than Streamyx of course and will buy my own modem.
And they ask me to come to TM Point tomorrow to start with the cancellation of Streamyx effective immediately.
Finally I am so happy to get a fibre like speeds for download which I have been stuck with slow Streamyx speeds for 10 years.