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That shit was legend. I mean, we were still using BBSs and phone phreaking. Here's this ubernerd that BROKE INTO the television signal. We bow before you, kinky ubernerd.
The power required to do it is impressive to say the least.
I guess the other option would be that the signal was created with very close proximity to the broadcast tower requiring much less power, but they probably had a limited area to search.
To me it almost reads like this was a "we technically can, let's test it out!" And it worked.
That's not how the attack worked. He didn't drown out the tower. He simply overrode the the studio-to-transmitter link signal. The studios used microwave line-of-sight transmitters to communicate a signal from the studio to the tower. All the attacker had to do was override that signal. That signal was 50W max. You could override it with maybe 200W as long as you were also in line-of-sight of the microwave receiver. Probably less since some microwave trasmitters were as weak as 1W. They don't need to be strong since they are line-of-sight directional transmitters. So, that's not particularly impressive.
Although, having to get a transmitter within line-of-sight makes the overall feat more impressive.