its about 80 percent less, but no not nothing. Defra approved stoves reduce further, the issue is the knowledge is limited. Studies are high level, so include those with old stoves, burning any old fuel , inc wet or treated wood.
logically if everyone used seasoned wood in a defra approve stove, then the impact would be much much smaller say than a diesel van doing a delivery, but that level of granularity has not yet been achieved.
the do nots are right, not burning anything is the perfect answer, as is not driving, flying, having deliveries or using public transport,not using electricity or gas, it all impacts us at either a macro or micro level, you just need to decide what level is acceptable for you, will you have a stove, order from Amazon, drive, get the bus, get the train, use electricity. Your choice on how far you go, but fundamentally they are right, do none of this is the safest option. If we all agree to do none of it.