Absolutely inaccurate. I am nationalized Spaniard living here 2+ decades. Almost no one over 50 calls on the phone and when they do they almost always send a message first. The large public institution I work in is removing landlines completely because they get too little use to justify the cost.

I am (mostly against my will) in multiple professional and personal Whatsapp groups. Use is constant and daily and unavoidable. It is the principal means of communication in both work and personal settings. Calls are always a second option.

I suspect your experience reflects only partial integration in local culture.