A budget is also time, resources, and latitude. Steve Jobs’ “Figure it out” was “I’ve given you a task, now go do what’s necessary to get it done”. This is what the post you’re responding to is referencing: the client is asking for something to get done but is not providing the resources required.

As a side note, engineers tend to be bad at couching conversations in these terms - nothing is impossible*, things just cost more or less, and that’s a decision for the money people to make.

* yes yes caveat caveat