ERC721 unable to be listed externally

Hey there! I havea Query regarding the ability to add erc721 tokens to Marketplaces...

this is the contract,

our hired developer has stated that the minted NFTs cannot be sold or auctioned on any external market places such as untill the total supply has been minted,

as im new and trying to learn im trying to understand if this is the case and how i can avoid in my own future projects

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I took a quick look, doesn't seem to have that restriction in place. Try listing it on opensea.