Can you demote from Platinum in Apex Legends?
There is currently no demotion if you drop into a lower tier, so if you earn your way into Platinum IV, no amount of losses will demote you back to Gold I – you are guaranteed to finish that Series in Platinum.
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Yes, Platinum Rank is very good.
It is at least above average according to the statistics since being in Platinum puts you in the top 9% of all Apex Legends players.
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This RP loss can't force you to go down a tier. That effectively means that if you reach Platinum, for example, in ranked split, you can't drop down to Gold for that split. Players can drop divisions if they lose enough RP to go below the division cutoff.
Gold: 33.72% Platinum: 18.82% Diamond: 2.51% Master & Apex Predator: 0.2%
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Yes, Diamond Rank in Apex Legends Battle Royale mode is a very good rank.
What percentage of Apex players are diamond?
Definitions. Loss Forgiveness: A state we grant you where any RP losses you might have are zeroed out. For example, in a Diamond match where you came in last place but had two kills, you would normally have a -28 adjustment to your RP (-48 from the Diamond entry cost, +20 for kills, for a net loss of -28).

Apex Predator tier is also exempt from the usual promotion and demotion procedure, since it is defined as the current top 750 players. Upon first entering Ranked Leagues, players are placed in "Rookie" tier, which serves as an introductory tier to ranked.
Unlike League and Overwatch, Apex players can't get demoted between tiers regardless of how many games they lose. They will, however, be able to drop divisions.
Tier demotion in Apex Legends works similarly to any other shooter game. Those who don't rank up higher and continue to lose games will demote to a more appropriate tier for their skill level. The tier bump relies on demotion protection. Players will get demotion protection for three games.
Being demoted from gold to silver or from plat to gold – or any LoL demotion – is something you want to avoid. In this section, we're going to explain how to get demoted in LoL so that you can try to avoid LoL demotion. You can only be demoted after you have played a game and lost.
Once you hit the bottom tier of any rank outside Predator you can't get demoted. This often ends up being frustrating for both the people who are stuck at silver/gold/plat/diamond/master IV as well as the people who are advancing through those ranks.