Taʿrīḍ principally asks, “At whom is this utterance indirectly aimed?” Kināyah often asks, “What associated meaning is reached from the words spoken?” Both are indirect, but the indirection can operate at different levels.
“Abundant ash” points by association to generosity, which is a standard kināyah. Rebuking an absent person in order to warn the person in front of the speaker illustrates taʿrīḍ.
Both features may coexist in one utterance; they should not be presented as absolutely incompatible.