Then I disagree. There are many fan-made stories where Asuna is involved with other male characters besides Kirito. If the inspiration really came from a specific work, there should be at least some basic similarities. From the character of Inoda, the core story, and the plot development, I don't see any similarity between these two works. The only thing similar is that Asuna has a sexual relationship with someone else. For me personally, this is not an inspiration. Fujino also never mentioned this so-called source of inspiration.
Besides, I personally put a lot of effort into finding this novel. It is not a popular work. I highly doubt that Fujino has even read it.
Of course, I'm not against Fujino drawing inspiration from other great works. In fact, he often does. It's always a pleasure for me to see exciting moments from other works recreated in Fujino's work.
But for this 刀剑情域 (author - 九幽) , no, unfortunately, I don't think it's part of Fujino's inspiration.