I think you may need to define what you mean by attraction, then. He said again comes and goes for both him and his wife. I see no reason to disbelieve him, especially since that is what I experience with my wife as well. It's fine if you have a different definition of attraction, one where the members of both couples here (his and mine) can be considered to still be attracted to each other. But simply stating that he's wrong does not advance the conversation or reveal what your point of view actually is.
My physical attraction to my wife comes and goes. When that first started happening, it was traumatic. At this point, it really doesn't feel like a big deal. There are always more important things to be working on when it happens. (Probably not coincidentally!)
A bit later in our relationship, the same thing started happening for more general attraction. The decision to stay together would get very practical for a time. Again, this was initially very traumatic, but over time it became more and more clear that it was an effect, not a cause. Our focus shifted to the true causes, to the extent we could figure them out, and that was vastly more effective than trying to somehow address lack of attraction directly.
In short, my experience directly contradicts your position, anecdotal though it may be.