I doubt they made those military equipment on 28nm even , more likely around 100nm .lol 5G telecommunication does not depend on 7nm nodes or even 14nm nodes.
Huawei's advanced unique 5G chips which are still unsurpassed by others are not allowed to be fabricated by TSMC and no Chinese foundry can make those 5G chipsets. But they still hold all the patents on dedicated 5G chips and the end result is still clear.
China's 5G rollout is many times greater than Europe and USA's combined until only recently when western Europe and USA caught up. Speeds are still greater in China and utilization. 5G has been operating on farms, construction, mines, street cleaning vehicles and of course phone users since two years ago. They are barely reaching phone users in western Europe and USA now. The speeds are nothing comparable and already China has launched two separate 6G technology testers once in 2020 and one this year.
5G requiring 7nm nodes is absolute bullshit. The equipment is not a smartphone and limited by space. 5G equipment is like military hardware and even 200nm nodes will do as India uses for some of their military hardware.
China already can do 28nm nodes and trying to deliver commercial scale 14nm and 7nm. Lab level production has already been done for over two years. They cannot yet get it to commercial scale with controlled costs though. 28nm is already plenty for equipment. Even 280nm is acceptable. It's just 10cm^3 more bulk maybe.
What China did in meantime to overcome the volume issue is stacking and bonding techniques. Even Samsung is applying new bonding and stacking techniques following this path since it makes their products even more efficient on at least space.
the writer of the article has mistaken military equipment with, laptops and smart phones