CoCoRaHS has a team of volunteer "readers" in addition to the 'coordinators'. This report would have been 'flagged' within hours / minutes. Note that the 'readers' report any questionable entries directly to a special database, and investigation proceeds from there.
An error could be as "trivial" as "mentioned flurries in comments, but entered zero as Precip total" "Hail in comments, no hail report sent", or "observer consistently submits 'round' figures (.1, .10, 15 etc)" ... Such reports are used as training guidance, or encouragement and rarely 'get back' to the observer, for example... monitoring purposes...mainly. CCR doesn't "harass" it's volunteers, recognizing they are humans, and 'stuff happens'...
The most common errors are simply 'typos', of course, but the teams become familiar with the areas / observers they monitor, and can note a possible issue quickly. Another common 'error' is a report submitted as 'today' when should have been a 'multi-day'.
The "Readers" make no changes in any reports, simply monitor them. From there any investigation or corrections are usually opaque to the 'reporter' (reader or other observer), with any corrections or action usually entered by CCR HQ, or coordinators in the comments portion of the suspected report. Almost always begins with contact with the reporting station, Obvious typos, etc are usually corrected immediately by coordinator or HQ.
Even 'Readers" will sometimes miss something obvious, so if you catch a suspect report, please let CCR HQ know! They don't mind.