A crossed-out regular price is a common way to present a discount. It does not tell you whether the discount is new.
The regular price is shown as $79 per bottle, and the current packages come to $79, $69 or $49 per bottle. The 2-bottle package is therefore at the regular price, while the larger ones are lower.
We cannot tell how long the current prices last.
Treat the lowest price as the actual price, not as a saving of a number you cannot verify. Confirm the total on the official checkout page before paying, and take a screenshot. Our guide on confirming current package pricing explains why.