L-sit : feeeling burn in lat muscles

So a while ago, I found out this video:

U27Zhz1GmC8

I wanted to improve my L-sit, so with my fingers facing the opposite direction of my legs, I tried a L-sit. Is this a sign that my lat muscles are underdevloped?

Do I need to show you a picture or something?

yes this will make the L sit much harder on the lats, posterior shoulder and triceps.

That may be your weak link currently... keep it up.