Don’t know much about these batteries yet but they are rumored to be much cheeper.
Cheaper than what?
Lithium
“Aluminium is more abundant/costs less than lithium, lowering material costs.”
I don’t know why Wikipedia spells “aluminum” that way, though. 
EDIT:
Oh, this must be why…
I will believe it when they are readily available and at a good price.
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Aluminium - that’s how it’s spelt in Australia, and I’m guessing the UK.
Yup, same here.
I honestly don’t know much about aluminum ion cells, partly because they’re not readily available yet. 
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Modern batteries are already dust cheap. I bought LGs 21700 for 2 EUR per piece.
Folks who pay $10 per battery pay that price not for lithium, cobalt and whatever material but for R&D, additional components (protection board), marketing, shipment and reseller’s interest.
So moving to cheaper materials won’t make any significant difference.
Where it will make difference is ESS at MWh-GWh levels.
Aluminum ion battery reaearch is not exclusive to Tesla, just like silicon anodes in lithium ion batteries are not, even though Musk tried to make it sound like it was in their big “battery day” presentation back in 2020.
In any case, battery technology announcements always need to be accompanied by the warning not to count your eggs before they hatch. I can’t count how many battery technology “breakthroughs” have been announced in the last 15 years or so. Instead of breakthroughs in battery capabilities, we have seen a gradual evolution.
Although Musk made sure to point out in the battery day presentation that a silicon anode could theoretically increase energy storage to 9 times what graphite anodes allowed, and suggested they had the challenges to using silicon anodes figured out, I think the actual improvement since then as manufacturers have managed to integrate small quantities of silicon into anodes has been around 15% increase in capacity.
What has been a breakthrough, however, is battery manufacturing costs. They have dropped by nearly 80% in the last 10 years.
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I’m not counting my eggs. The rumor is they are using flourine. I went to a dioxine confrence where nearly all the speakers had advanced degrees in addition to their MD’s If you burn chlorine you get dioxine. If you burn flourine you get chemical weapons. Perhaps enough to set off the detectors in airports and government buildings. Teslas will burn even without their batteries. Musk is using a lot of magnesium. But I don’t want to alarm any one.