Sorry, but don't think pasteurization heats to higher temperatures, it is only sterilisation that does that. If the bread is made with the honey as bread ingredient, it'd have been baked to 180C or higher (at least for all the breads I know). This is higher than pasterization. Also processed food as mentioned in the quoted article is not the same as baking. Obviously if the bread is just coated with honey afterwards, it's a different matter altogether.
Anyway, if you are unsure or worried, you should not feed it to your baby, no harm in waiting a few more months.
Yes, you are right I stand corrected on the temperature of pasteurisation being lower than baking. But like the website states, "Botulism may be prevented by inactivation of the bacterial spores in heat-sterilized, canned products or by inhibiting growth in all other products. Commercial heat pasteurization may not be sufficient to kill all spores and therefore safety of these products must be based on preventing growth and toxin production." The risk of honey bread is during the proofing of bread dough when the botulism spores can multiply before it is killed off by the bake off. The baking won't guarantee (although it is likely) that all the bacteria will be killed. If pasteurised honey is used in the initial process, there isn't anything to worry about but it may be difficult to find the labels that will state what kind of honey is used. And yes, glazing the bread with honey is a whole different matter altogether. It is best just to wait a few months.
"According to the CDC, infants with botulism 'appear lethargic, feed poorly, are constipated, and have a weak cry and poor muscle tone,' which may 'progress to cause paralysis of the arms, legs, trunk and respiratory muscles.'
Although parents often know not to give their infants under twelve months of age plain honey, they often overlook other foods that contain honey in them, such as Honey Graham Crackers, Honey Nut Cheerios,
Honey Wheat Bread, etc. Although the honey in these foods may be processed, it may not be pasteurized, and so may still contain botulism spores in them and should be avoided. If you feel strongly about giving these foods to your infant, call the manufacturer to make sure that they are safe."