Alinka – of course your AGM was legal, but I still think that your Strata Manager is confusing the requirements for Executive Committee Meetings with those for General Meetings where, common courtesy aside, there’s no requirement for those in attendance (ie the O/C) to formally agree to your husband speaking.
All things considered, I’m inclined to agree with your Strata Manager’s assessment that the matter is not all that important in the overall scheme of things, and so minuting that you husband wasn’t permitted to speak is not worth persuing in my opinion.
As I suggested, if your husband is better able to express your joint opinions on matters to do with the management of your Plan, then grant him your proxy and he can speak to his hearts content.