The best hand on that board
On the same board the Omaha nuts are not the Hold'em nuts. The only example is K-Q-J-T-2 with mixed suits.
PageOne board from the comparison article. No second board, no outs, no bet amount, and no kicker table.
The published board
Mixed suits
K, Q, J, T, 2. The 2 means this is not a Short Deck board. Short Deck is 36 cards with 2, 3, 4 and 5 removed.
Hold'em
On this board the Hold'em nuts are a straight that uses an ace. Hold'em may use one hole card. It does not have to put two hole cards into the hand the way Omaha does.
Omaha
Two hole cards: an ace and one card below
The ace and one of the board's K, Q, J or T have to sit inside the exactly two hole cards you use. A-9-8-7 is not the straight, because only the ace would be used. The other two of the four hole cards are not in the hand.
PLO5
PLO5 also uses exactly two of five hole cards and three from the board. This page does not publish a separate PLO5 nuts board. The pot-limit size is not calculated.
Questions
No. The published board is K-Q-J-T-2 with mixed suits. The Hold'em nuts are a straight that uses an ace. Omaha has to put that ace and one of the board's K, Q, J or T inside the two hole cards it uses.