Residente Permanente

You will most likely be asked to purchase a six-month tourist visa at the airport. You won't have any problems entering Tijuana. Do you plan to use the CBX (Cross Border Express)? It is expensive but very convenient. Otherwise, you can cross on foot at San Ysidro or Otay Mesa and hail a taxi. Before Covid, I always would cross at San Ysidro, walk downtown TJ (10 minutes from the border crossing) and take a bus directly to the airport for 14 pesos.

With regard to the alert that you should not enter as a tourist, that is something above my pay grade. However, it is always easier to ask for forgiveness than it is to ask for permission. "But the authorities at the Tijuana airport made me buy a six-month tourist visa!"

Also, as of yesterday, there was no problem getting back into California from Tijuana. Crossed both ways via auto using SENTRI to get back into San Diego.