Well, with a conventional recall many defunct vehicles will never get repaired and still driven for years whereas this fix will be rapid and hard to avoid even if one tried. It's not not serious, but the implications are much less severe. Can call it a recall but it's not equivalent to what most manufacturers call a recall.

Not a tesla fan either but it kinda is less serious. I assume the compliance % of an over the air update is much higher than physical recalls. Like I bet people are still driving with faulty Takata airbags or other serious recalls.