The actual fix for the bug (discussed in the article) can be found in GitHub PRs [1][2]. Uniswap is ignoring this PR for a long time for some reason.

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[1] https://github.com/Uniswap/uniswap-v2-subgraph/pull/86

[2] https://github.com/Uniswap/uniswap-v3-subgraph/pull/5