I would suggest you read the article, but it appears that Guzman offered some assistance to get someone else on the ballot (which would force a primary). The nature of that assistance is what the question and discussion is about.
We are going to start here
Guzman responded Saturday by calling Chapa LaVia's allegations "ludicrous and politically motivated" and said she picked on del Bosque's petitions "knowing that he did not have the money, resources or connections to enter into an expensive and protracted legal process."
Thanks to election commission you can see his filing here. You need 439 valid signatures to be on the ballot, he submitted 57 pages with 14 lines on each page so that would be a potential maximum of 798 (the most you can submit is 703), it looks like 662 lines were filled out and not scratched out. Some of these are going to have issues (I saw one Warrenville for example). But he may very well have enough valid signatures.
Chapa LaVia's campaign has contended that Guzman and his campaign helped collect petition signatures for del Bosque, then had them notarized incorrectly without the actual petition passers present. Chapa LaVia's campaign referred to that as "fraud."
Found more on this rule explicitly in Colorado, but I did find this from a candidate in Illinois also something along the same lines from Frerichs campaign here.
You must sign as the circulator of the petition before a Notary Public licensed in Illinois and the Notary Public must affix his/her seal or stampThat's kind of what a Notary does. So if this did happen that is an issue, if it didn't happen I don't see why you would incur an expensive legal battle you would just need to testify.
Guzman even offers a defense
n Saturday, Guzman released a statement saying that while he did help del Bosque, "in no uncertain terms" was fraud committed. He also said neither he nor any campaign workers or volunteers circulated petitions for del Bosque. He also said Illinois case law clearly allows petitions to be notarized without the petition passer present "if the circulator believes that they are under oath when they sign their name to the petition attesting that they personally collected the signatures on the form."Then share the case law with the dude and help him out. It isn't that complicated...
It's the second largest city in the state man, this isn't nor should it be patty cake.