The provided context is insufficient to furnish a comprehensive answer, as one source is a link to a discussion forum without its content, and the other contains irrelevant boilerplate text. The following information is therefore based on established general knowledge of The Legend of Zelda: Tears of the Kingdom.
The appearance of Silver Lynels within the game is directly correlated with player progression. The game employs a hidden scaling system wherein defeating a significant number of enemies increases the difficulty and tier of monsters that spawn in the world. Consequently, locations that initially host Red-Maned or Blue-Maned Lynels will eventually feature Silver Lynels as the player becomes more powerful. A player who has not advanced sufficiently in the game will not find this enemy type.
For players who have reached the requisite progression level, Silver Lynels can be found at several fixed locations on the Hyrule surface and in the Depths. On the surface, notable spawn points that will scale to the silver tier include the grasslands north of the Snowfield Stable in the Hebra region, the area near the Lanayru Promenade, and the Akkala Highlands east of the Upland Zorana Skyview Tower.
The Depths contain numerous Lynels, including a guaranteed encounter that is particularly noteworthy. The Floating Coliseum, located north of the Great Abandoned Central Mine, presents a boss rush challenge against five consecutive Lynels. The final two combatants in this gauntlet are a White-Maned Lynel and an armored Silver Lynel, making this a reliable and repeatable location to find the creature. Other individual Lynels scattered throughout the Depths will also scale to the silver variant over time.
