Yes. An applicant must be able to show source of funds so if you have not paid taxes, you cannot show  funds from work; similarly if you are now claiming to have money from investment property that you bought and then sold, you will have a much harder time showing where you earned the money  to buy the property . Tax records are often the best and easiest way to show proof of income so a deficient or non existent tax record in a country where taxation exists is going to be quite problematic.  

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It really depends. I have had EB-5 cases where Indian citizens are non-residents of India and there may be tax exemptions for them. Some countries do not have taxation on personal income. It will be best to work with an experienced EB-5 lawyer as well as a foreign tax advisor to analyze what your options are and what/if any remedies you can take to correct any omissions or errors.

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