Lk99 must be mentioned in the research section table of contents. Either pro or con. From any researcher. It also counts if the body of the article mentions lk-99 or an unambiguous reference to qerc or materials brought to prominence by the lk-99 papers.

Here's an example ToC. Nature publishes weekly and it appears that the ToC is always online. https://www.nature.com/nature/volumes/620

It only counts if mentioned in a scientific context, not just as an example of problems with science or failures of the process.

EDIT: I think this is implied, but the start date is the creation of this claim