我相信你的目标如下。

• 您希望删除重复的文件。在这种情况下，您希望保留最早的文件作为创建日期。

在您的脚本中，不包括用于检查创建日期的脚本。那么，在这种情况下，下面的修改怎么样？在该修改中，如下修改函数removeDuplicateFile()。

修改脚本：

function removeDuplicateFile() {
  let folder = DriveApp.getFolderById(FOLDER_ID);
  let files = folder.getFiles();
  if (!files.hasNext()) {
    return;
  }
  
  // Retrieve files by parsing the filename and the file size.
  let list = {};
  while (files.hasNext()) {
    let file = files.next(),
      name = file.getName(),
      size = file.getSize(),
      date = file.getDateCreated().getTime();
    let key = name + size;
    list[key] = list[key] ? [...list[key], { file, size, date }] : [{ file, size, date }];
  }

  // Keep the oldest files.
  let removeFiles = Object.values(list).reduce((ar, v) => {
    if (v.length > 1) {
      let [, ...f] = v.sort((a, b) => a.date > b.date ? 1 : -1);
      ar = [...ar, ...f.map(({ file }) => file)];
    }
    return ar;
  }, []);

  // Remove files except for the oldest files.
  removeFiles.forEach(f => f.setTrashed(true));
}

• 运行此脚本时，将通过检查文件名和文件大小来检索文件列表。并且，删除重复的文件，同时保留最早创建的文件。
• 在此修改中，不使用您的isDuplicateFile。

参考资料：

• reduce()
• map()
• forEach()

function removeDuplicateFile() {
  const folder = DriveApp.getFolderById("fid");
  const files = folder.getFiles();
  let fObj = { pA: [] };
  //collect all files with same names into an object of arrays 
  while (files.hasNext()) {
    let f = files.next();
    let n = f.getName();
    let dv = f.getDateCreated().valueOf();
    let id = f.getId();
    if (!fObj.hasOwnProperty(n)) {
      fObj[n] = [{ name: n, value: dv, id: id }];
      fObj.pA.push(n);
    } else {
      fObj[n].push({ name: n, value: dv, id: id });
    }
  }
  fObj.pA.forEach(p => {
    fObj[p].sort((a, b) => b.value - a.value);//sort descending by date created
    fObj[p].forEach((ob,i) => {
      if(i > 0) {
        Drive.Files.remove(ob.id);//deletes files  permanently
      }
    });
  });
}

您可能需要启用驱动器API

保留最旧文件并删除Google云端硬盘中重复文件的替代方案

请注意开启驱动器API。

function keepOldestFilesOfEachNameInAFolder() {
  const folder = DriveApp.getFolderById("INSERT FOLDER ID");
  const files = folder.getFiles();
  let fO = { pA: [] };
  let keep = [];
  while (files.hasNext()) {
    let file = files.next();
    let n = file.getName();
    //Organize file info in fO
    if (!fO.hasOwnProperty(n)) {
      fO[n] = [];
      fO[n].push(file);
      fO.pA.push(n);
    } else {
      fO[n].push(file);
    }
  }
  //Sort each group with same name
  fO.pA.forEach(n => {
    fO[n].sort((a, b) => {
      let va = new Date(a.getDateCreated()).valueOf();
      let vb = new Date(b.getDateCreated()).valueOf();
      return va - vb; // I have modified this line to retain the oldest one instead of the newest files created
    });
    //Keep the oldest one and delete the rest
    fO[n].forEach((f, i) => {
      if (i > 0) {
        Drive.Files.remove(f.getId());
      }
    });
  });
}

• 参考：* find duplicate files in one folder and removing the oldest one? (Google Script)