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@retro_vélo
I am a qualified Carpenter and Design Engineer and have in the past work on a number of equipments and structures where I had to conduct stress analysis. As indicated in my previous contribution the two elements which generally dictate the overall strength of a component are the ultimate tensile strength of the material and the Moment of inertia of the section which is roughly defined as the resistance to deformation as a result of its shape and form.
There are other factors which come into play such as the direction of the loading as wood is more effective in compression whereas steel and aluminium are more effective in tensile. But the Ultimate tensile strength(UTS) and the Moment of Inertia(MoI) are the two keys elements to be considered in any stress calcs.
To say that 'laminated solid wood handlebars would massively out-strength hollow aluminium bars' is guessing.