Well, seeing a 900 foot Jesus might or might not be a genuine vision. I couldn’t say anything about that alone. Getting back more than one has tithed... well there are sincere Christians who have sworn that their money goes further after tithing than it used to go before. But a machine... it’s a bit cringe worthy, though God will start there if that’s the best you know. He stoops to great humility. But it’s no place to end: God ain’t a machine!! God is a loving person!! And a preacher should be at the point where he knows better.
It was during the time that many of these preachers were making ridiculous promises that one would get back ten times their tithes. Like sowing a crop. It was ridiculous.
Does God always meet my needs? Of course. The idea that I would give to a preacher so I could get more back from God is silliness. I should give to a preacher because I have been taught by them.....even Paul said one should do so