This is not the case, not even close.
Matchmaking does not take into consideration any stats like W/R etc when determining teams.
Players get distributed onto teams based on the ship they are in and that's about it. Matchmaking within the first 3 minutes attempts to make teams with:
even numbers of each ship per side
even numbers of each tier
adhering to ship restrictions (CV / DD numbers)
Some of these restrictions are lifted outside the 3 minute mark in an attempt to make the match before the 5 minute mark.
Aspects including:
Player skill
Player W/R
Player premium status
Player clans
Playing a premium ship
Have no bearing on matchmaking.