The researcher probably wasnt surprised, it looks like the person you replied to was surprised. Perhaps i was surprised that you were surprised? :)

I'm surprised by all these appended suprises revealing a history of surprise :D

Surprisingly, the researcher might also have been surprised the first time they found out.

“You” is ambiguous in English.

https://www.merriam-webster.com/dictionary/you:

  1. the one or ones being addressed 
  2. ONE sense 2a (which is “being one in particular”)

So, pro tip: in chat-like discussions with strangers such as hacker news, one should prefer saying “one” when using sense 2, even if it sounds a bit archaic (at least to me. Is it?)

Also, when reading a “you” that could be interpreted both ways, do not assume it is used in sense 1.

"One" is very archaic, I always fear it will be confusing for non-native speakers, and sound stuck-up to native speakers, and tend to avoid it.