That‘s the principle but in any aircraft heavier than a typical single engine prop you actually fly throttle for speed, pitch for descent rate and combine both. The reason is that a heavier airplane simply becomes too inert so the reaction is waaay too slow to control speed with pitch etc. The engines are powerful and have a much greater effect. In an airliner you push the theust levers forward if you become slower instead of pushing the nose down. Don‘t forget the principle though, it will safe your ■■■ if you have problems.
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