The source discusses taʾwīl (تأويل) as a way of identifying what the apparent assignment points beyond. It is not simply saying “the literal claim is false.” It specifies why a related element is named in place of the proper bearer.
أَنْبَتَ الرَّبِيعُ الْبَقْلَ
Spring caused the vegetation to grow.
If context makes the season a relevant cause or setting rather than an independent creator, the figurative relation is intelligible. A comparable supplementary example is “شَفَى الطَّبِيبُ الْمَرِيضَ” (the physician healed the patient), where the physician may be mentioned as the means of treatment. Its interpretation is likewise contextual.