Listing agents don't provide disclosures, owners do. The listing agent may have some exposure, but Texas law indicates that the proper target is the prior owner.
Fraud in a real estate transaction - https://statutes.capitol.texas.gov/Docs/BC/htm/BC.27.htm#27.01
Limitations period is 4 years from the date they knew, or in the exercise of reasonable prudence, should have known of the fraud.
The difficult part of cases like this is proving knowledge. How long did the LLC own it? Did they flip it? Making grading/drainage improvements may be evidence of knowledge, or may be evidence that they saw a drainage problem and tried to fix it (again, assuming a flip situation and not living in the home).
Then - if you are lucky enough to be able to prove the knowledge element - you get to try and collect from the LLC. Most of the time, the LLC relates to a singular property. If the LLC is, strangely, holding LOTS of properties in its name that might be used to satisfy a judgment, i would imagine they have them leveraged to frustrate collection efforts.