No. The "no hair theorem" has a condition that says "after a while", but people ignore it because it's a short time. So intermediately after the object entered

No. The "no hair theorem" has a condition that says "after a while", but people ignore it because it's a short time. So intermediately after the object entered the black hole will have bump and will emit gravitational waves and after a while it will be a perfect sphere (if it's not rotating, or a similar round elongated shape if rotating). As far as I can understand, it totally unrelated to Quantum Mechanics.