It sounds as if you already participated in the skydiving activity which was the subject of the "liability contract". If that document was executed for the specific purpose of that one dive, which is now completed without any adverse affect on you, then it is now essentially a nullity, and of no concern to you. If it covers future skydiving events as well, then you have made an intentional and material misrepresentation that goes to the heart of the agreement which could arguably nullify your rights to any benefits under that agreement that you would otherwise have, should that misrepresentation be discovered. I think you are already aware that it is never good to lie.
I think you are good to go.
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If you had died and your death was related to or caused by the condition, it would protect the company from your family suing for wrongful death.
If they find out, they won't let you skydive again.
You should not lie. Your condition is on the list for a reason, why increase your changes of getting injured?
I may be guessing or not licensed in your state. No atty/client relationship exists. I earn my living collecting points for "helpful" answers.
You may need psychological counseling to find out why you may have a death wish. It is one thing to sky dive, it is another to potentially increase your risk of injury or death by lying about a known condition.