Seeing errors in dashboard: Deprecated: Creation of dynamic property

Hello, a whole bunch of these are now showing up in my error log (snippets provided for reference) – are these fixable or should i ‘ignore’?

Deprecated: Creation of dynamic property WP_Private_Content_Plus::$site_lockdown is deprecated in? {{hidden for security}}/wp-content/plugins/wp-private-content-plus/wp-private-content-plus.php on line 113

Other examples:
Deprecated: Creation of dynamic property WP_Private_Content_Plus::$post_attachments is deprecated . . . . .

Deprecated: Creation of dynamic property WP_Private_Content_Plus::$ip_restrictions is deprecated . . . . .

Deprecated: Creation of dynamic property WP_Private_Content_Plus::$site_lockdown . . . . .

Deprecated: Creation of dynamic property WP_Private_Content_Plus::$woo_tab_manager. . . . .

Okay to ‘hide’ or is this going to become a critical issue on my website?

The page I need help with: [log in to see the link]