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Monday 12 February 2018 at 21:36
I suspect this could be referring to using something like the pinball hardtop that OutsideEdge introduced at Expo in October.
https://pinside.com/pinball/forum/topic/hardtop-playfield-new-product-announcement-poll-included
http://www.pinballgifts.com/hardtop.html
Source: http://pinside.com/pinball/forum/topic/twip-is-deeproot-the-next-misadventure-or-a-pinball-revolution/page/11#post-4226515