There may be some ambiguity here (naming things is hard). The example you shared is the $min aggregation operator, whereas what’s been deprecated is the $min query modifier.
For example, you can still do the following in 6.0+:
db.sales.aggregate(
[
{
$group:
{
_id: "$item",
minQuantity: { $min: "$quantity" }
}
}
]
)
however you would no longer be able to do:
db.sales.find({ $query: {}, $min: { quantity: 25 } });
but would instead need to use the cursor methods such as:
db.sales.find({}).min({ quantity: 25 });