Questions about example sentences with, and the definition and usage of "Deepl"

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A: Technically, nothing here is omitted at all.

This is what's known by linguists as "inversion", where part of the sentence which would normally be at the beginning is put at the end instead (the same thing sometimes happens in Japanese, too, actually).

The non-inverted sentence here would be "Doesn't it suck?", but the "doesn't it" is put on the end instead, and it becomes "sucks, doesn't it?". This reordering changes the emphasis (making it seem like more of a statement than a question), but doesn't actually change the basic meaning.

So this is why you need the part on the end if you are going to "leave out" the beginning, because the part on the end actually technically is the beginning part of the sentence (it's not left out, it's just moved).

A: It is.
The most natural ways to say this sentence are “Koala numbers are declining,” “The number of koalas is decreasing,” or “The koala population is decreasing.
“Koala numbers are declining” sounds more formal. I would put this in an article or say it if I was giving a presentation.
“The number of koalas is decreasing” and “The koala population is decreasing” sounds more casual. I would say this if i was having a conversation or posting about it on social media.

A: I wonder why DeepL still doesn't support Korean when it has supported many languages.

But I like the tone of your voice. You could be a radio announcer or work in voice acting/broadcasting industry!

A: DeepL is an internet translation tool https://www.deepl.com/ja/translator. Thanks anyway.