No, this isn't entirely true. They are obligated to issue a procedural fairness letter in cases like this. We aren't trying to scare anyone more than they should be once they receive a PFL which is very very serious.Dont worry about it at all. Just explain it why you had refused. I think people here just scaring cases like you without thinking thoroghly before they discuss about the problem. Yes there are people in the forums who banned for 5 years and its because of contradiction between their new and old applications. They dont reject you straighaway in fact they check the contains you had provided in the previous application and compare it to your current application. Your work experience, marriage, the employers. If they find out any fraud and contradiction they will reject you straightaway without any soft tongue. good luck you will get pr soon.
Do not take a PFL lightly.