Yep, I agree with what they all said. Remotely here is an adverb and it means, "a little, a bit" It is at times synonymous with, "slightly", although remotely is more on degree, content and distance.
Yes, you may use remotely in conversations, but when using NOT + REMOTELY, you are placing STRONG EMPHASIS on zero possibility. Although I suggest putting 'even' after 'not' to complete the thought.
EXAMPLE:
A: Wow, the seminar was so great. The speaker was so eloquent.
B: What? Are you kidding me? The seminar was not even remotely challenging! Yes, the speaker was so eloquent, but all the exercises were too elementary for Middle Managers.
Using remotely in other ways:
A: Are you done with the report?
B: Yes, I'm, handing it in tomorrow. You done, too?
A: Hah! Not remotely. Gotta work overtime tonight. (Meaning: Not close. Far from done. Not in the slightest)
Another more formal conversation:
A: Last quarter was a letdown. We almost reached the sales quota!
B: Yeah. I hope we get to this quarter. The new manager's very capable.
A: I doubt it. It's still remotely possible even if the management set a lower quota.
B: You're such a pessimist.