What Lightroom Classic normally looks for is not the Creation Date of the file, but rather a capture date and time of the photo as recorded separately in the file. I don't know how or why the modification date has got used in this case, but when a photo is 'sent via WhatsApp' then who knows what metadata may result. Possibly along the way some photo capture date metadata arrived within the file which matched the file modification date, and that is what the Catalog then used.
You do have available the Edit Capture Time tool (accessed in Library module, Metadata menu) which has an option to to alter the Catalog's date for each photo, to follow the Creation Date of the respective file. In the screenshot below you can see the 2007 correct info (derived from original capture info saved into the file by the camera, for the previewed photo) and below that, what date this particular photo would get overwritten to if I proceeded.
