Is it obligatory to make up for six months of missed prayers for someone who neglected them and repented, knowing that there is difficulty in prostrating due to extreme obesity, and does "repentance expiates what came before it" apply to this case?

Based on the view that makes qada' (making up missed prayers) obligatory, which is the more cautious approach, a person who misses prayers due to laziness must make up those missed prayers according to their capacity, along with repenting from this grave sin. If they do not know the exact number of missed prayers, there is a specific method for making them up. However, according to the other view, qada' is not obligatory for them. I apologize for not evaluating individuals or their methodologies.