Yes, but that’s the OPs point. No one cares about the price of TVs. The metric (core inflation and CPI) isn’t measuring peoples experience accurately.
Because it is never that clear cut.
If food goes up by 2%, gas/electricity by 3% and TV/video games/cars by 2.5% you can say inflation is ~3%
If food goes up by 30%, gas/electricity by 100% and TV/video games/cars by 2.5% saying inflation is 10% by using magic maths is bullshit
(and frankly, to a small extent their argument is valid. If everyone switches from Coca-Cola to Pepsi, even if they do so because it's cheaper, then Coca-Cola has no place anymore in an inflation index. Prices are meant to affect buying behaviour and products must be allowed to replace each other)
Yes; that's why the number in the headline is 10%, not the 5% core number.