Even better to provide a source for each statistic.

Japan has about half the plastic waste rate, yes [1].

However, the top recycling search result claims Japan only has a 19% recycling rate compared to the US’s 24% [2], but you might have been referring to a specific recycling type?

[1] https://ourworldindata.org/grapher/plastic-waste-per-capita

[2] https://en.wikipedia.org/wiki/Recycling_rates_by_country

Since very few types of plastic are actually recyclable most of it ends up being burned despite being separately collected, so I don't think you can simply discount the recycled plastic from the plastic waste being produced.