I think it’s much more likely that he was using the plain sense meaning of the phrase to describe the speed with which the rapture will occur.

For the trumpet will sound, the dead will be raised imperishable, and we will be changed. 53For the perishable must be clothed with the imperishable, and the mortal with immortality.… http://biblehub.com/1_corinthians/15-52.htm I think it’s much more likely that he was using the plain sense meaning of the phrase to describe the speed with which the rapture will occur. https://gracethrufaith.com/ask-a-bible-teacher/twinkling-eye/ In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed. https://www.pcog.org/about/our-work/trumpet The complaint that Christ makes against this Churches is that it "had left its First Love".