Will I still be able to see the person in the "find people" search, or will they just not show up?
I'd like to know so I can put certain suspicions to rest.
82 Answers
If a player has blocked you, and their profile is still Public, then you can still see their profile. However, if you attempt to add them, then you will get an error message saying that you are unable to add them as a friend. Furthermore, attempts to send communication to them will be cut off, even if you attempt to bypass this by finding a similar group the player who has blocked you is also in, and attempt to chat with them this way.
I'm fairly sure that you will be able to see their username, but when you click on their profile, you won't be able to access it because you're blocked. If you need to see their profile however, I suggest just visiting steampowered.com on Chrome, and then searching for a user through the website rather than the Steam client.
Edit: Never mind, you have to login to search for a user, and it just takes you to the blocked page. So, no, there are no known loopholes for this.
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