But......
The TV production keeps money in the country that would otherwise be sent offshore.
The hairdressing is just money circulating among locals.
Now I'll put this scenario forward to illustrate:
Let's suppose that everyone who lives in a small town all decides they can fix the town's unemployment problem by creating service industries which result in each adult resident of the town all employing one other adult and paying them $100k a year.
Sounds good doesn't it? The town's GDP has gone right up and now everyone's got a $100k job.
So what's the problem? Well it becomes a huge problem when people start trying to spend that money on anything not produced completely within the town. Because with no money coming back in, whilst the individuals all have an income the town as a whole is earning precisely zero, and any spending on goods and services from outside simply runs down capital.
To work it needs the town to have an income from external sources, people living in it need be selling something to others not just themselves in order to bring money in.
Hence why ghost towns exist. Once the external source of income dries up, once the mine or whatever sustained the town shuts, the rest falls apart real fast. Come back even after just a few years and you find that most of the homes are either abandoned or have been physically removed or demolished and the town's population has collapsed. Because without that external source of income it just doesn't work.
Now that same concept does apply at a larger scale. A country that imports without exporting is ultimately going to end up poor. The TV factory avoids the imports, and may even export, but there's no national income to be had from cutting hair or delivering food to locals.