Are you in the US?
Bacteria and viruses are everywhere they keep us alApparently there is some noted concern and it's even illegal to feed to chickens..
https://cluckin.net/why-is-it-illegal-to-feed-mealworms-to-chickens.html
To me the real problem comes if the sub straight is contaminated..
https://www.frontiersin.org/articles/10.3389/fmicb.2020.01613/full
Noting dry meal worms are WAY less enticing than live ones.. I kept my own colony and fed them out a plenty.. I never, not once had any issue with salmonella.
Live BSFL won't grow in my area due to low temperatures. Meal worms are a SLOW turn around at my temps.
Dry mealworms from China may have been fed on cardboard or styrofoam.. and not nutritious at all.
As others have noted.. the fat content is the only main issue.. Here on BYC.. you're always gonna get your entire routine questioned because there are many who are trying to use these type of high fat insects as their main feed source.. so we tend not to presume anyone's understanding.
Salmonella CAN infect eggs from the inside before laying.. quote and link follow..
https://www.livescience.com/10016-salmonella-eggs.html
"outbreaks of salmonellosis (an infection caused by
Salmonella bacteria) still happen because
Salmonella also silently infects the ovaries of healthy-looking hens,
contaminating the eggs inside the chicken before the shells are even formed,"
For ME.. feeding meal worms and darkling beetles is "SAFE".