I think it depends a bit more on the specifics and the timeline than your question suggests.
In the specific case, it is not clear what the final state of the thread will be. As we discuss this, the question is "on hold," but it might be improved and reopened.
Moreover, we are not really talking about a repost of a comment as an answer. It seems more that the two were given independently.
On the one hand, the poster of the comment might (then) decide to expand their comment into an answer (or not) and they may be inconvenienced by the delete. On the other hand, there is some value in having the timeline preserved for a thread where there might be a discussion regarding "on hold."
Also note the comment is in a way a request for clarification of the post it says that assuming something (unconfirmed) some answer is given. This clarification is not yet given (at least not directly).
Finally, if the question does not get improved it will likely be deleted and the question is moot. And as a further aside there are other comments that could be deleted, too.
Thus, in brief, in the specific case it is too early to decide what should happen and thus the comment is kept around.
For general guidelines:
In a case that matches more closely what is described in the linked to meta question that is, the content of the comment is reposted and it is made clear that the answer-post is based on a comment (especially if it is the comment of somebody else) as described in a comment here by Roddy, I'd say yes, the comment then can be deleted.
Yet, just there being a later answer that subsumes a comment does not make it directly eligible for deletion, especially not somewhat close in time. The poster of the comment should at least have had a chance to expand their own comment before it gets deleted or otherwise finalize their interaction with the post. Also, the timeline should be preserved at least for a while.
I don't think we need to provide a record of everything forever, but in the specific case the flag came in two hours after the initial comment. For my taste that's too early in this type of situation.