Are Archer's twin blades a bootstrap paradox? According to this, Archer's weapon is based from a real weapon.

In the Holy Grail War, Shiro Emiya saw the servant Archer use those weapons. Then he traced them and used them himself. In the future, he will become the servant Archer and will be using those blades as his weapons. 

Isn't it an example of bootstrap paradox? Where did he get the idea to use those weapons in the first place? Did the VN explain this?
The Archer-EMIYA summoned by Rin is different from Shirou coming from a different timeline where the results of the Holy Grail war were different; the visual novel notes 3 key differences between them:


Archer believed that he could Kill Shirou, thus erasing him from ever becoming a Counter Guardian. If Archer and Shirou were the same he would have known well that he would lose.
Shirou learns Unlimited Blade Works from Archer during the war (in the Unlimited Blade Works route it's helped by a contract with Rin, while in Heaven's Feel it's helped by Archer's own arm). Archer, however, took ten years of training to set the foundations for Unlimited Blade Works and another ten years to reach to the point of being able to use it.
The Shadow caused an undisclosed amount of destruction during the 5th War Archer was involved in. When he first saw it in Heaven's Feel, he put aside his grudge against Shirou and focused on destroying the Shadow as his duty as a Counter Guardian and also in a belief that he could prevent the same destruction again. It's unknown if Archer knew if the Shadow was Sakura or if his twisted life and Counter Guardian ideals (kill one to save many) made him no longer care if destroying The Shadow would result in Sakura's death.


Now, as for Kanshou and Bakuya, they do exist before Archer and Shirou, and their legend remained. However, what they look like was practically lost with the only known description being that Kanshou had a black tortoise shell pattern and Bakuya had a white wave pattern. Their actual shape was derived by Archer himself based on an assumption that they were cast swords common to the time period.

Now, the Projections Archer and Shirou use are inferior to the actual items. With weapons, they need to emulate the experience of that weapon's legends and its history. Shirou just copying "two swords that he admired from a guy he disliked" would make the swords weak, so given time he would probably research the swords and come to the same assumptions as what Archer did, and Archer would have researched the swords as a means to build up his arsenal in Unlimited Blade Works.

Since the true description on their appearance is somewhat lost, Kanshou and Bakuya would be the perfect test weapons on the concept of creating "existing weapons with a new form". This way, even though emulating the experience for the weapons would still make them weaker, being able to improve on them by changing their form and fixing their inherent weaknesses may help them become just as powerful as the originals. I can back this up as I've read somewhere that Archer has modified the design of Kanshou and Bakuya to suit his style so they are more customized.