"Two or three months ago there was a lot of rush, lots of pressure to look for a location. But one month later, they told us to wait," the source told Reforma.
Several sources previously told Reuters that Tesla planned to begin production in Mexico in 2025.
Tesla did not immediately respond to a request for comment on Wednesday.
Nuevo Leon's economy minister, Ivan Rivas, declined to comment on Tesla's timeline, saying it was a matter for the company to address.
Reforma also reported that a timeline from Danish engineering consultancy Ramboll, taking into account the permitting process, suggested the site would only be ready for construction in 2027.
Ramboll did not immediately respond to a request for comment.
