do note the mention that this chart is only illustrative and not actual data

Embark basically officially confirms the following (reworded a little):

• Matchmaking based on playstyle similarity is more likely, but not guaranteed.
• Your behavior shapes your future lobbies gradually.
• There are not only two kinds of lobbies (friendly and aggressive) but rather a scale.
• Matchmaking doesn’t overreact (one shot or kill does not immediately put you in “PvP-focused” lobbies).
• There are no guaranteed “PvE-only” lobbies/servers where other Raiders will never attack you.
• Your end-of-round feedback does not affect matchmaking.
• Your loadout does not affect matchmaking.
• Patches and updates don’t reset your matchmaking profile.
• Looting knocked-out players doesn’t affect your matchmaking.
• Matchmaking is not based only on the squad leader but the whole squad.
• Turning crossplay on or off does guarantee you a specific kind of lobby, only the pool of players available (so matchmaking time).

Changes to matchmaking:

• Defending yourself is no longer treated the same as starting a fight.
• Low-activity rounds carry less weight in your playstyle history (you can’t just give up over and over to get into PvE lobbies)