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Tags have no rules of their own.

From the introduction section of the Monster Manual:

The parenthetical tags provide additional categorization for certain creatures. The tags have no rules of their own, but something in the game, such as a magic item, might refer to them.

Therefore, tags have no effect on the creature's Type. The Elf tag does not indicate humanoid or fey, it is merely a category marker.

So, no, hold person does not affect Eladrin since they do not have the Type of Humanoid.

Tags have no rules of their own.

From the Introduction to the Monster Manual (or the corresponding part of the Basic Rules):

The parenthetical tags provide additional categorization for certain creatures. The tags have no rules of their own, but something in the game, such as a magic item, might refer to them.

Therefore, tags have no effect on the creature's Type. The Elf tag does not indicate humanoid or fey, it is merely a category marker.

So, no, hold person does not affect Eladrin since they do not have the Type of Humanoid.

Tags have no rules of their own.

From the introduction section of the Monster Manual:

The parenthetical tags provide additional categorization for certain creatures. The tags have no rules of their own, but something in the game, such as a magic item, might refer to them.

Therefore, tags have no effect on the creature's Type. The Elf tag does not indicate humanoid or fey, it is merely a category marker.

So, no, hold person does not affect Eladrin since they do not have the Type of Humanoid.

Tags have no rules of their own.

From the introduction section of the Monster Manual:

The parenthetical tags provide additional categorization for certain creatures. The tags have no rules of their own, but something in the game, such as a magic item, might refer to them.

Therefore, tags have no effect on the creature's Type. The Elf tag does not indicate humanoid or fey, it is merely a category marker.

So, no, hold person does not affect Eladrin since they do not have the Type of Humanoid.

Tags have no rules of their own.

From the introduction section of the Monster Manual:

The parenthetical tags provide additional categorization for certain creatures. The tags have no rules of their own, but something in the game, such as a magic item, might refer to them.

So the tag has no effect on the creature's Type. Elves are not humanoids or fey, this is merely a category marker. So, no, hold person does not affect Eladrin since they do not have the Type of Humanoid.

Tags have no rules of their own.

From the introduction section of the Monster Manual:

The parenthetical tags provide additional categorization for certain creatures. The tags have no rules of their own, but something in the game, such as a magic item, might refer to them.

Therefore, tags have no effect on the creature's Type. The Elf tag does not indicate humanoid or fey, it is merely a category marker. 

So, no, hold person does not affect Eladrin since they do not have the Type of Humanoid.