Around 33 minutes into the presentation he does address radiation briefly, noting that it's favorable because most of the issues relate to the ceramic insulator

Around 33 minutes into the presentation he does address radiation briefly, noting that it's favorable because most of the issues relate to the ceramic insulators in traditional SC magnets. In their design, the steel structural component of the tape serves as the insulator; they just wind up the SC tape and the current travels along that 1um SC layer. More generally, the demountable coils suggests that designs could be made where the magnets are replaceable with some degree of economy.