According to the meaning of this sentence itself, and the current dictionary explanation should be "Ji".
According to historical research, "Preface to Prince Teng's Pavilion" was written by Wang Bo of the Tang Dynasty, and Wang Bo's calligraphy was running script and cursive script. There is no way to verify whether the character "ji" in the running script and cursive script during the Tang Dynasty is the same as Qi.
But from Wang Bo, that is, during the reign of Emperor Xuanzong of the Tang Dynasty, the word "Ji" can be found in Yan Zhenqing's Yan style and Liu Gongquan's Liu style, which were the most popular at the same time. I probably remember that in Liu Gongquan's Mysterious Pagoda Stele Having seen "Ji", I can be sure that there was such a word in that period.
However, it is impossible to test whether the meaning of "Ji" during the Xuanzong period of the Tang Dynasty matches the meaning of this sentence.
In short, human language itself is a part of the evolution of human society, and it is also constantly evolving. If it is too rigid, it will destroy the hazy beauty in the text, so don’t get into trouble.