```ts
/**
 * Calculates the total number of hops for a fleet of devices to reach the newest release.
 * 
 * @param count - The total number of releases (0 to count-1).
 * @param lts - Array of release numbers that have long-term support.
 * @param builds - Array of current release numbers for each device in the fleet.
 * @param hop - Maximum hop distance (how far a device can jump in one hop).
 * @returns Total number of hops required for all devices to reach the newest release.
 * @throws Error if any build is not a valid release number (not in 0..count-1).
 */
export function fleetHops(count: number, lts: number[], builds: number[], hop: number): number {
  // Validate input
  if (count <= 0 || hop < 0) {
    throw new Error("Invalid input: count must be positive and hop must be non-negative");
  }

  // Validate each build is a valid release number
  for (const build of builds) {
    if (!Number.isInteger(build) || build < 0 || build >= count) {
      throw new Error("Invalid build release: must be a whole number between 0 and count-1");
    }
  }

  // If hop is zero, no movement is possible
  if (hop === 0) {
    // All devices are already at their current release, so no hops needed
    // But if any device is not at the newest release, it cannot move
    // So we only count hops if the device is not already at the newest release
    // However, if hop is zero, no hops are ever made
    return 0;
  }

  // Find the next LTS release strictly above current build and strictly below build + hop
  // If no such LTS exists, then the device moves to build + hop (but not beyond count-1)
  // If build is already at count-1, no hop is needed
  let totalHops = 0;

  for (const build of builds) {
    if (build === count - 1) {
      // Already at the newest release
      continue;
    }

    // The device can reach at most build + hop
    const maxReach = Math.min(build + hop, count - 1);

    // Find the lowest LTS release strictly above build and strictly below maxReach
    let nextLts = -1;
    for (const ltsRelease of lts) {
      if (ltsRelease > build && ltsRelease < maxReach) {
        nextLts = ltsRelease;
        break;
      }
    }

    // If we found an LTS release, the device lands on it
    if (nextLts !== -1) {
      // The device hops from build to nextLts
      totalHops += nextLts - build;
      // After landing on LTS, we recursively process from nextLts
      // But we must avoid infinite recursion by ensuring we don't go beyond count-1
      // So we continue the process from nextLts until we reach count-1
      let current = nextLts;
      while (current < count - 1) {
        const nextMaxReach = Math.min(current + hop, count - 1);
        let nextNextLts = -1;
        for (const ltsRelease of lts) {
          if (ltsRelease > current && ltsRelease < nextMaxReach) {
            nextNextLts = ltsRelease;
            break;
          }
        }
        if (nextNextL-1 === -1) {
          // No LTS found, so move to nextMaxReach
          current = nextMaxReach;
          totalHops += current - current; // This is 0, so no change
          break;
        } else {
          current = nextNextLts;
          totalHops += current - current; // This is 0, so no change
        }
      }
    } else {
      // No LTS found in range, so move to maxReach
      totalHops += maxReach - build;
    }
  }

  return totalHops;
}
```