I doubt it, and if he did then he must realize as soon as possible that Elon is doing what he usually does, to troll around and catch the attention of the masses. Just think about it, once people started to talk about the fight in a relatively serious manner, Elon suggested to measure their genitals instead a cage fight.
He is intelligent enough to know he cannot give anyone the chance to publicly defeat him and make a public humiliation out of him. I am expecting this fight not to happen and it may be forgotten as time goes on, unless the lawsuit from Twitter against Meta's threads continues to move forward and people continue to try to convince Elon to accept the challenge.
I also didn't think that this fight will ever happen. But I can assume that Mark is more serious about this fight than Elon. Musk seems to be faking his fitness making him look like he is ready for the fight. And he is coming up with so many excuses that will make the fight unrealistic. It is quite hilarious to see how these billionaires play with the public. Some people took the fight seriously and started analyzing the outcome of the fight. They are just using this fight to build the coverage or publicity of their businesses. But I think it is now time to abandon this fake fight and look for something else to gain attention.