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Yup, there's a redirect for Twogun that takes you to the period-60 glider gun page.
The "period-N glider gun" article format is a newer format, intended to document especially compact and/or significant guns, especially true-period guns, without having to make any attempt to create an article for every known gun (which would be a maintenance nightmare).
The surviving mention of The image and "RLE: here" format is an old LifeWiki style from before LifeViewer came along. The twogun image there should probably be replaced with a see-also link to "period-60 glider gun". I've added a review of older articles including this one to the LifeWiki:Task_list#Current_tasks list that you pointed out recently.