Everything in my top dressing is already in my soil, but everything in my soil isn't in my topdressing.
That's because things like gypsum are vital for terpenes, but too much gives a weird skunky taste, not a good skunky taste, so global mixes aren't always best long term as top dressing.
Also too much soft rock phosphate will mess with myco, so you don't want SRP in a top dressing unless you really know your soil.
After a couple runs your pot will get to heavy on some ingredients.
Myself I don't like meals in top dressings. Meals should be cooked in or composted before top dressing.
A green meal finding raw carbon in the pot will hot compost in the pot.
But meals in a tea work fine, really fine, so he recomended teas as well.
I run all my meals thru my worm farm to compost them and that way they are already in my EWC in a safe manner.
One of the few premixed things I buy is a premade top dressing. It's only marginally more expensive than making it yourself, so id I can't find an ingredient I need to make topdressing (covid supply chain issues are still real) I don't hesitate to use a commercial topdressing.
By the sounds of his recomendations, he is actually telling you good advice, not trying to just sell you something in a bottle. He likely knows his stuff, as it was good advice he gave you.
Exactly what I do actually.
As for a soil rebuilder, I don't know how much you should use as every mix is different in strength, but those are excellent ingredients.
Personally, I wouldn't top dress with it, I would follow his advice or purchase an actual organic top dressing.
You need a worm farm
. Go sit on Santa's knee, make promises you likely won't keep, and see if Santa brings you one.