As I said in the start of my previous comment, CS is not always knowledgeable, and sometimes they will get you completely wrong information.
As an example, a couple weeks ago I was making a deposit, loaded the cashier through the downloaded casino and it popped up a webpage with a site name like "ignition473-dot-eu," just some random number in there. Sure sounds like a fishing site, right? So I go to support on the normal website to make sure it was a legitimate website, and they tell me it's not. After about 20 more minutes of dealing with support, finally manage to get them to confirm that it was in fact their website and not some sort of fishing attempt.
If they can't even tell me whether or not a website I'm supposed to deposit on is a fishing website or if it's their own legitimate site, can you be confident that some random support person is giving you the correct information on a technical question about a 15 year old slot? Unfortunately, probably not.
In terms of perfect confirmation of what I said, that's going to be difficult to find. While it's an obvious assumption, the game does not tell you that information. However, these slots have been discussed on here for years when RTG was more popular and it wasn't just a handful of people on this quiet section of the website, and I'm pretty sure that specific piece of information was confirmed by someone who worked at RTG. But it would be tough to find the actual info. I'm like 99.9% sure it's correct though.
So basically, how it works is that if say a slot is designed to payout every $500,000 wagered (just a hypothetical number, I don't know the exact one, and it may depend on the slot.) So every time you spin $5, you would have a $5/$500,000 = 1/100,000 chance to hit. If you spin $2, you have a 1/250,000 chance. So wagering $1000 in $2 increments or $1000 in $5 increments ends up with the same chance of hitting. Your chance is directly proportional to the total amount you wager. So I would recommend just wagering whatever amount you are most comfortable with, rather than raising or lowering it expecting the slot to play differently or the jackpot odds to be different.
That's just for the randomly awarded jackpots though, if you play a game with a jackpot based on a payline win it may be different (like 5 wilds or whatever).