Yes! By his reckoning, anyhow. It does not feel that way to me!

[And, well, if Flowey is interested, Ingo supposes there's no reason to be vague about it.]

I evidently lived in that time with him, and then something happened that caused me to travel into the past! But whatever it was caused amnesia as well - at least, I assume they were connected - so I do not actually know what happened. He does not either...as far as he knew, I simply disappeared one day.