Absence of evidence is not evidence of absence, plus citation needed. Not to mention that you can only know whether the foundation improved after you build on

Absence of evidence is not evidence of absence, plus citation needed. Not to mention that you can only know whether the foundation improved after you build on top of it... which is something we can only observe in the future. Note that I am not saying that you are incorrect in your assessment. All I am saying is that it's too early to know one way or another.