You mean, that's because his Projection's Attribute is Sword. Hence he cannot project anything else without the added cost on his mana and whatever.
Quote:
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After the connection to Saber is gone, it can be said his image of Avalon also disappears.
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Copied that from wiki. To put it simply, an imprint doesn't just 'disappear', there must be a reason to it. You repeatedly say that since Avalon is in his body for so long that he remembered every single detail of it, thus projecting a perfect Avalon, then it could be said that if there's one NP he will never forget or fail to project, it will be Avalon. But he can't do it after Saber's gone. That is to say that his projection is just giving shape for Avalon to appear, a catalyst, but the power behind it ultimately belongs to Saber's Avalon.
If he does have a different copy of Avalon, then he OWNS an Avalon copy, thus he can USE the Avalon copy. However, he does not have one and cannot use one.
And, due to translation inconsistencies, it is always possible that the Nasu interview excerpt you showed can mean something like, "Shirou's image of Avalon is Saber. Since Saber is gone, he no longer can project Avalon." Apparently love-love could have something to do with it, and if that is really the case then I am wrong, of COURSE he cannot project Avalon since his image of Avalon is Saber. Lover gone, so say goodbye to Avalon as well. *sniff sniff waves handkerchief*