Oh yeah. He's 100% right there. The best blueberries I've ever had were done with mulch over the topsoil after 10 years of working the soil and then tilling it over to plant the blueberries, replant the Raspberry's, and relocate the chives.
Whatever it is my grandma does to that soil is absolutely amazing for any plants she puts in it. Those blackberries and golden Raspberry's tasted so good and sweet I'd think they were candy
The only issue is skunks like to nest nearby. I grew up in that house and I don't miss living there. Every summer you couldn't escape the spraying and if you had dogs like we did they get sprayed frequently.