INEOS football endeavor hasn’t shown any success. So being confident this early is not backed by anything but hope.
But it depends on our definition of success. Most likely we’ll be in better shape than post Fergie era, if that’s the standard.
I checked the records for the two other clubs owned by them and it's thoroughly mediocre.
In their 7 years ownership of FC Lausanne-Sport, the club has yo-yoed between the first two divisions in the Swiss league. They were relegated in their first season at the helm, stayed there for 2 seasons, came back up for two season before being relegated again and then coming back up last season. They are in 8th spot this season and likely to stay up again.
In their 5 years Nice have finished 5th, 9th, 5th, 9th & are currently 5th, 5 points behind Lille in 4th.
You are correct that there is nothing in their history of owning football clubs that shouts that they are going to be massively successful here. However, the points in their favor are:
(1) Jingoism, after a long time the club will be partly owned by a
Local Lad, which is a matter of pride for some.
(2) The Glazers have been completely atrocious. The Glazer kids come across as the dollar store version of the Roy Kids. They are totally clueless and have carelessly allowed some absolute jokers to waste GBP 1b+ of the money on utter mediocrity the last XI years. So, with the Jim holding their hands, we should definitely see some improvement.
(3) I do not know about the finances at FC Lausanne-Sport or Nice, but we are one of the richest club in the world and have a massive fan base. Our commercial, broadcasting and match-day revenue are huge, with a potential to harness them further. If Jim and buddies are able to appoint some top people to the posts and streamline the operation, we can be very successful without INEOS needing to be absolute geniuses.
(4) Luck always plays a part in these things, and hopefully ours will change with Jim and the team taking over our football operations.