No, just because OpenRouter tracked model growth doesn't mean the tracking itself caused the models to expand, that's a basic misunderstanding of cause and effect.
Tracking is a low-cost way to observe, like my party spreadsheet shows who RSVP'd but doesn't make them show up.
The actual expansion comes from developers creating new models and OpenRouter deciding to list them; the data just records it.
It's a minimum effort record, not the engine driving the whole thing.