Probably not a problem. Our floors were so uneven in the upstairs it would have been nearly impossible to install a hardwood or LVT.Is a level floor a problem even for new/newish houses? Mine is 7 years old.
One way and there are many to check a floor is the string method. Stretch the string from one end of the floor to the other. If you see gaps under the string, it will give you an idea of the severity. Do it in multiple locations keeping the string even and tight. Measure north/south east/west.
Level is a relative term. As luv my super said: a relatively even floor is suitable. Our upstairs has places where hvac has been moved and the floor would have required a self leveler. My wife wanted carpet, so I was in luck.