i am not knowledgeable on the fine points of how specific vacuum tubes are constructed, perhaps there or others that can comment who have more knowledge
i would say, having a fairly vast connection of such tubes of various brands/makes from us europe japan etc, 6dj8, 12au7, 12ax7, 6fq7 and so on, that both types of construction you show via the link are quite common... i see more of the ones with the ’intermediate horizontal plate’ leading up to the suspended getter on somewhat later iterations of the various tubes, perhaps it is to make the tube more robust against mechanical shocks and not go microphonic or worse
i would say, having a fairly vast connection of such tubes of various brands/makes from us europe japan etc, 6dj8, 12au7, 12ax7, 6fq7 and so on, that both types of construction you show via the link are quite common... i see more of the ones with the ’intermediate horizontal plate’ leading up to the suspended getter on somewhat later iterations of the various tubes, perhaps it is to make the tube more robust against mechanical shocks and not go microphonic or worse