diff --git a/lib/private/PreviewManager.php b/lib/private/PreviewManager.php
index 578c256aac068..3672d812095c0 100644
--- a/lib/private/PreviewManager.php
+++ b/lib/private/PreviewManager.php
@@ -107,8 +107,7 @@ public function __construct(
 	 * @param string $mimeTypeRegex Regex with the mime types that are supported by this provider
 	 * @param ProviderClosure $callable
 	 */
-	#[\Override]
-	public function registerProvider(string $mimeTypeRegex, Closure $callable): void {
+	private function registerProviderClosure(string $mimeTypeRegex, Closure $callable): void {
 		if (!$this->enablePreviews) {
 			return;
 		}
@@ -300,7 +299,8 @@ protected function getEnabledDefaultProvider(): array {
 	 */
 	protected function registerCoreProvider(string $class, string $mimeType, array $options = []): void {
 		if (in_array(trim($class, '\\'), $this->getEnabledDefaultProvider())) {
-			$this->registerProvider($mimeType, function () use ($class, $options) {
+			$this->registerProviderClosure($mimeType, function () use ($class, $options): IProviderV2 {
+				/** @var IProviderV2 $class */
 				return new $class($options);
 			});
 		}
@@ -426,7 +426,7 @@ private function registerBootstrapProviders(): void {
 			}
 			$this->loadedBootstrapProviders[$key] = null;
 
-			$this->registerProvider($provider->getMimeTypeRegex(), function () use ($provider): IProviderV2|false {
+			$this->registerProviderClosure($provider->getMimeTypeRegex(), function () use ($provider): IProviderV2|false {
 				try {
 					return $this->container->get($provider->getService());
 				} catch (NotFoundExceptionInterface) {
diff --git a/lib/public/IPreview.php b/lib/public/IPreview.php
index 56c31430f4959..b4ebf4a439f2d 100644
--- a/lib/public/IPreview.php
+++ b/lib/public/IPreview.php
@@ -5,8 +5,6 @@
  * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
  * SPDX-License-Identifier: AGPL-3.0-only
  */
-// use OCP namespace for all classes that are considered public.
-// This means that they should be used by apps instead of the internal Nextcloud classes
 
 namespace OCP;
 
@@ -35,19 +33,6 @@ interface IPreview {
 	 */
 	public const MODE_COVER = 'cover';
 
-	/**
-	 * In order to improve lazy loading a closure can be registered which will be
-	 * called in case preview providers are actually requested
-	 *
-	 * @param string $mimeTypeRegex Regex with the mime types that are supported by this provider
-	 * @param ProviderClosure $callable
-	 * @since 8.1.0
-	 * @see \OCP\AppFramework\Bootstrap\IRegistrationContext::registerPreviewProvider
-	 *
-	 * @deprecated 23.0.0 Register your provider via the IRegistrationContext when booting the app
-	 */
-	public function registerProvider(string $mimeTypeRegex, Closure $callable): void;
-
 	/**
 	 * Get all providers
 	 * @return array<string, list<ProviderClosure>>