Generally this is not the case. If you start playing, your first opponents will be (other) double-digit kyu’s, and if you lose those games, you’ll find yourself ranked similarly to any beginner within 2 or 3 games.
The problem arises when you win one or two early games by error, for example when the first 11k and the second 4k opponents resign because they don’t want to play against beginners. The system can’t see whether those games were legitimate or not, and as a result the new player gets ranked as if they are a 1d or something. It’s the best estimate the system can get. Garbage in, garbage out.
On the other hand, if we allow people to say they are beginners, this will inevitably make sandbagging easier, thus you’d still have beginners getting crushed several times.