The audio sounds like "lubje" and not "lubję" - ę is not emphasized.
Yeah, that's one of the faults of the TTS voice, the final 'ę' in the word is not nasalized. But some people don't nasalize it or almost don't. I do and I think it should be.
I'm not a native Polish speaker here so I'm not trying to contradict, but a book I was using to learn Polish stated that the 'ę' at the end of a word is pronounced "with no nasal sound in all but the most careful speech".
3 years later, I actually wouldn't say "I do and I think it should be" anymore :D
"I don't like the view out of my window" - what was wrong with this?