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That can be one way that it is done--but it is usually not a very accurate way.
Most of the Hondas (up into the early 90s at least!) that ran fuel injection used Manifold Air Pressure (MAP) as the primary determinant of load--how much air is going into the motor. The throttle position sensor is used more to determine if the throttle is currently being opened more, or currently closing, or is already closed, or already wide open. That will add or subtract some from the basic metering, which is based on MAP.
More modern systems directly sense air flow (with an Air Flow Meter of some kind) to determine engine load and the primary calculation of how much fuel they add. Again, the throttle position is used to fine-tune that.
A few old systems, and also the Mechanical Fuel Injection used on older Diesels and some rather old gasoline cars (e.g., BMW 2002 tii, 69-72 Porsche 911s, etc.) did use throttle position as the primary measurement of engine load. It worked, but was not very clean or efficient.
-soD
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