Is what is attributed to Ibn Taymiyyah regarding the expiation of an oath, for someone who did not intend anything specific, limited to certain purposes, and why was that not explicitly mentioned in his books?

The madhhab (school of thought) of Sheikh Al-Islam Ibn Taymiyyah is that whoever ties divorce to a condition, and did not intend for the divorce to occur upon the fulfillment of that condition, then their ruling is the same as that of one who takes an oath. Their divorce does not take effect, but rather they are liable for an expiation for breaking an oath (kaffarat yamin). This includes those whose intention was to threaten, prevent, or encourage, and so on. Ibn Taymiyyah said: "If his intention was to swear by it, and his purpose was not for these matters to occur... then his ruling is the same as that of one who takes an oath; it falls under the category of an oath."