Does the meaning of 靓丽 change depending on how 靓 is pronounced？
According to the 两岸 dictionary, the pronunciation for 靓丽 works like this:

【臺拼】jìnglì
【陸拼】liànglì

So this is mostly a Taiwan vs. Mainland pronunciation difference.
According to the Students Dictionary of Classical and Medieval Chinese normally jìng means:

1 make up one’s face (woman), apply cosmetics, rouge.
a) prink, adorn, embellish, trim.
2 ⦿ 靜 jìng 1, quiet, still, tranquil, calm.

While according to KEY liàng means:

{dialect} attractive, good looking, pretty, handsome, beautiful

Longman's also notes:

〈粵〉
❶ 漂亮﹐好看：靚女／靚樣。
❷ 美味的：靚湯。

So it seems this Cantonese pronunciation has somewhat taken over on the mainland while not influencing Taiwan as much.