What is collected
Community server owners can turn on stats tracking in the RCON console. When they do, WARDOGS NOW samples that server about once a minute and records, for each connected player, the in-game name, the SteamID64, the faction, and the current-match kills, deaths, cash and time. That is what appears on the stats pages, under the name and SteamID64 the game reports. Nothing is collected from servers whose owners have not turned tracking on, and nothing is collected from official servers.
If the owner also turns on the live kill feed, a new kill can store both Steam IDs, the weapon, the distance and whether it was a headshot. Those lines are not created for kills that happened before the feed was turned on.
A removal request deletes your sessions, totals, weapon counts and the stored kill lines that name your Steam ID. Your name and SteamID64 are then added to a do-not-track list so future samples and public weapon totals skip you. A request is handled by a person, usually within a few days, and you will hear back at the email you give if you give one.