To explain its policies to preserve its non-partisan way of fact-checking claims, AFP Factuel mentions the AFP's Code of editorial standards :
“AFP understands that its staff members will engage in such external activities as community affairs, politics, support for social or other causes, independent writing including books and online projects. While the Agency respects staff members’ freedom to do so, there must be a clear separation between what is done in a personal capacity and in a professional capacity. It is reasonable to identify ourselves as working for AFP, but the Agency’s name should not be used for promotion or in campaigning, and the Agency should be informed. We must do nothing that might cast doubt on our ability to provide unbiased coverage or that impinges on the Agency’s reputation for impartiality. Nothing in this is intended to restrict AFP journalists from engaging in these activities; the aim is to ensure that outside interests do not come into conflict with AFP's interests or reputation.”
According to my assessment, I can tell that AFP Factual do not seem to support a candidate in any elections nor to advocate or take policy positions on any issues not strictly related to fact-checking.
The AFP's Code of Editorial Standards is here : https://www.afp.com/sites/default/files/paragraphrich/201701/22_june_2016_afp_ethic.pdf
2b marked as Fully compliant by Laurent Bigot.