I'm not sure you use the right option for strikethrough but this can off cause be personal but try to read this article
The \ element represents a removal from the document.
The \ represents contents that are no longer accurate or no longer relevant.
That is to say that they actually represent different things semantically. Specifically \ would be used if you had an existing document and wanted to indicate text that was in the document, but has been removed. This would be different than text in a document that is no longer accurate, but that has not been removed (you could use \ for that).
I'm not sure you use the right option for strikethrough but this can off cause be personal but try to read this article