Use of "will" in a past tense sentence

Reading an article today I stumbled upon this sentence:

A day before we first speak, Page will talk to his mom about this interview and she will tell him, “I’m just so proud of my son.”

I was wondering if anyone can clarify to me what is the form (or construct) corresponding to "will" usage in this case. My intuition is that it's used to describe a future action in the past or something like that. I would have probably used "would" instead of "will" to achieve that. I've tried googling such constructs but with no luck.

Thanks a lot!

A day before we first speak, Page will talk to his mom about this interview and she will tell him, “I’m just so proud of my son.”

There is nothing wrong with that form and it requires no correction or improvement.

The action has been moved to the perspective of the future as seen from the past. It is akin to a prediction/prophecy, albeit one to which the prediction has already been realised.

The form is related to the historic present: "It is the year 1709 and the whole of Europe is involved in yet another war."

Thus

"It is the January of the year 1709 and, by April, the whole of Europe will be involved in yet another war."

The future in the past is constructed with "was/were going to" or "would", as you rightly felt (englishpage).

In the diagram below (from englishpage.com) the black cross represents the reference time (when we spoke), and the blue cross represents the future with respect to that cross. It is to be noted that the blue cross can be found on the right of the present mark; if it is, then the action has not yet been realized.

enter image description here

A day after we first spoke, Page would talk to his mom about this interview and she would tell him, “I’m just so proud of my son.”

The pattern of your sentence is different because you say "before the talk"; it is as follows. (Nevertheless, you need the past tense for the verb "to speak".)

enter image description here