Can I extend my O-A visa in Thailand by depositing 800k Baht in a bank account?

I've just come across the passage below regarding extending an o-a visa. I was unaware that it is possible to extend it in-county by depositing 800k in a Thai bank. The passage makes no mention of seasoning. The best thing is to check with them, but I thought I'd ask here first anyone has information on, or experience of, this? Could I deposit 800k in a bank a couple of weeks before my visa expires and expect it to be extended for a year? Thanks.

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"*5.4 Foreigner who wishes to extend his or her stay shall submit a request for extension of stay at the Office of the Immigration Bureau with documented evidence of money transfer or a deposit account in Thailand or an income certificate showing an amount of not less than 800,000 Baht or an income certificate plus a deposit account showing a total amount of not less than 800,000 Baht. A one-year extension of stay shall be granted at the discretion of the immigration officer to the foreigner as long as he or she meets the above requirements*."