This explanation makes no sense to me:
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It implies that a vocabulary simply CANNOT be imported from any other tool that a learner uses. Because if you do, any word that already exists in the LingQ database (and there will be MANY of them) will be OVERWRITTEN. So any current ‘recognition’ (level 2 ‘recognized’ and above) will be LOST.
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Overwriting each of these words creates a DATABASE INCONSISTENCY in the in the LingQ vocabulary database, with a LingQ level 1 (‘new’) combined with NO SELECTED MEANING of this word. To my knowledge, there is no way to achieve the same inconsistent state when using the system in a normal way - if you make a ‘blue’ word into a ‘LingQ’, you are also forced to select a meaning of that word.
So if the system is designed to work in this way, you should really review that design!