Within a short time after the apparition, something like 10 million native people in Mexico converted to Catholicism. Sounds pretty miraculous to me.
People are not stupid. Even 16th century people. They eventually figure out when someone is pulling the wool over their eyes. Lots of bogus “miracles” are soon forgotten and have no lasting impact. But Our Lady had a huge impact which continues nearly 5 centuries later.
Now I have read that there was some legitimate suspicion from Church authorities of the image in its early days, trying to downplay stories of its miraculous origin. I also am pretty skepitcal of the supposed reflections in the Virigin’s eyes, at least of the level of detail supposedly found in them, with the bishop and the family and all. (As I recall, there was some digital “image enhancement” involved, which is automatically suspect). But that aside, there remains much about the image which seems genuinely miraculous.
But even if not - our faith does not rest on this miracle, but on the life, death, & resurrection of Jesus Christ!