Are bricks technically a type of pottery?
If you look at the various online dictionary entries for 'pottery' such as the Lexico one And the definition given on websites and blogs run by and for potters such as this one you will find a high degree of consenus on the idea that 'pottery' as a mass noun refers mainly to items which are containers, although some (such as the blog under the link above) have wider definitions like
Both pottery and ceramic are general terms that describe objects which have been formed with clay, hardened by firing and decorated or glazed.
Items which are considered by the sources using tighter definitions not to be pottery include ceramic art objects such as figurines and articles like fine art vases which, although they are containers, are primarily beautiful objects.
Bricks, tiles and pipes are certainly ceramics as are pieces of sanitaryware like handbasins and toilets, since they are usually made from clay and fired, but bricks and tiles aren't containers or, usually art objeacts, Decorative glazed tiles can be art objects but roof tiles are not. Pipes aren't containers either since they are designed so that liquids can flow though them rather than be retained and sanitaryware doesn't bear much resemblance to the sort of domestic utensil normally called 'a pot'
Given that bricks and roof tiles are not containers and not decorative objects they are not 'pottery' by most definitions even though they are utilitarian ceramic objects. By extension clay pipes and sanitaryware aren't 'pottery' either by most definitions.