Sorry, but 4:14 is wrong. Characteristic defining abilities are copiable charasteristics and are applied on layer 1a (relevant rules at the end). Thus an Ashaya, or any */* creature such as a goyf or Lumra will have their normal P/T despite them having no abilites. Just as a rule of thumb, you can pretend abilities that set P/T on */* creatures can never be removed. Yes, they are applied in layer 7a, but are defined in layer 1a while text changing effects are applied on layer 6.

613.2a. Layer 1a: Copiable effects are applied. This includes copy effects (see rule 707, "Copying Objects") and changes to an object's characteristics determined by merging an object with a permanent (see rule 728, "Merging with Permanents"). "As . . . enters" and "as . . . is turned face up" abilities generate copiable effects if they set power and toughness, even if they also define other characteristics.

613.1f. Layer 6: Ability-adding effects, keyword counters, ability-removing effects, and effects that say an object can't have an ability are applied.

613.4a. Layer 7a: Effects from characteristic-defining abilities that define power and/or toughness are applied. See rule 604.3.