You would do well before to research the issue further before you commit to such advice because there is ample evidence in the Building literature to contradict such advice.
Here is on such example:
It should be noted also, that the amount of roof or gable vents necessary to vent the attic is directly related to the size of the attic itself.
For example, one formula suggests to have at least 1 square foot of roof ventilation for each 100-150 square feet of attic floor space.
For example, If you have a 60x30 foot ranch home, this equates to 1800 sf of attic floor space, and the need for at least 12-18 square feet or more of roof ventilation (1800 divided by 150 or 100)
The attic ventilation can be achived by adding 12-18 roof vents, about 24-36 linear feet of ridge vent or 12-18 square feet of gable vent.
The problem with the gable vent alternative, is that in order to create 12-18 sq feet of ventilation, you about twice as many gable vents as the typical 3 foot wide by 3 foot high vent can provide.
In short, most gable vents would not provide enough roof ventilation to adequately vent the attic space, and while soffit ventilation is helpful, roof ventilation is the most critical ventilation factor to be considered in the formula.
In other words, if the air can get in but cannot get out, you haven't solved the problem at all.
You should also research further because ventilation may only be a part of solving the overall problem.
If you have moisture being added to the attic that shouldn't be there, even with the proper amount of ventilation, the moisture will still be present.
Personally, I am not satsified with the architect's advice because the building literature contradicts it and there are other factors involved which are not ebing considered.