My local C of E cathedral sent out a mailshot during COVID asking for donations with a range from £50 - £1000 options on the card (yes, really). I've never had anything like that from JWs.
I get visits from the local air ambulance team looking for donations but I'd classify them as a charity, not a salesman. Even though the person is under contract (employed) to do the task of going door to door, it would be a charitable engagement and not a sale. I asked the last guy if he got commission - he said no.
I think your issue is with religion, not sales people, which is what this article is about.
Because then a marketing person could say "but I'm only trying to make you aware of $PRODUCT; I'm not trying to sell it!"
The guy from the local baptist church gave me a some book about being saved by Jesus (it had instructions on how to pray I think? dunno threw it away) but he didn't ask me for any money.
By contrast, the Lithuanian girl who was trying to sell religious books (no idea who they were - some encyclopedias? it was very odd) was trying to sell them to me (nice girl, had come to this country and was living in a dorm? was confused why UK taps had hot/cold separately instead of a combined tap). The guys scamming me about a roof repair were definitely not doing it free. Nor were the guys trying to get me to switch internet provider, nor the guy offering me window replacement and double glazing, nor the woman selling me "lucky lavender", nor the guy selling sponges and cleaning products for tiny amounts of change.
That's what I was saying - people who ask for money or donations are salesmen. People who don't, aren't.
Nuisance religious callers and general unsolicited visitors is another topic. The article is about sales calls, not general nuisances.
So someone calling you to "make you aware of $X" does not count as sales?
And they would be permitted to call you?
I hope they fix this loophole quickly!